a professor wanted to investigate whether the amount of time students studied for a test would impact their final grade. the professor has 3 classes each with 25 students. the first class did not study for the final. the second class studied an average of 5 hours. the last class studied an average of 10 hours. which class is the control group?

Answer:

y[tex]\geq[/tex]2x-3

Step-by-step explanation:

y intersect is -3

slop is 2, which eliminates option 2 and 4

when plugging in the point 2,2 in the equation- its a true solution for option 3.

y[tex]\geq[/tex]2x-3

2[tex]\geq[/tex]4-3

2[tex]\geq[/tex]1     True.

Zelma is 28 years old and her son is 10 years old. We brought this conclusion with the help of algebra.

Let x = son's age now

Then, x+18 = Zelma's age now

x-1 = son's age one year ago

x+17 = Zelma's age one year ago

x+17 = 3(x-1)

x+17 = 3x-3

   2x = 20

     x = 10

Algebra is the study of variables and the rules for manipulating these variables in formulas; it is a unifying thread of almost all of mathematics. Elementary algebra deals with the manipulation of variables as if they were numbers and is therefore essential in all applications of mathematics.

To know more about algebra, visit: brainly.com/question/13715639

#SPJ4

Answer:

y-(-10)=3(x-(-4)

Step-by-step explanation:

Using slope point formula (y-y1=m(x-x1)) we can use the given coordinates to fill in the equation.

y1=-10 & x1= -4

Put those into the equation: y-(-10)= m(x-(-4))

Now we need to find the slope using slope formula y2-y1/x2-x1: -19-(-10)/-7-(-4)= -9/-3

Simplify the slope: -9/-3= 3

End up with your final equation: y-(-10)=3(x-(-4))

-Hope this helped

In order to test the efficacy of the drug, some students are provided with the actual drug whereas others are provided with a dummy version of the drug.

To test the efficacy of the drug, you want to compare the exam scores of the students who took the drug to those who took the placebo. This is known as a double-blind, randomized controlled trial and it is considered the gold standard for evaluating the effectiveness of a treatment. By comparing the scores of the students who took the drug to those who took the placebo, you can determine whether the drug is actually improving exam performance or if the improvement is due to other factors such as placebo effect or chance.

Learn more about placebo effect here brainly.com/question/10913418

#SPJ4

Answer:

$24

Step-by-step explanation:

30 times .80=24

The value of x is 7.

Collinear points are the points which are formed on a straight line, whether they are close or far away.

Figure representing the question is given below.

From the figure, we have,

AB + BC = AC

(-1 + 2x) + (11) = 3x + 3

2x + 10 = 3x + 3

Like terms adding together,

2x - 3x = 3 - 10

-x = -7

x = 7

Hence the value of x is 7.

Learn more about Collinear Points here :

https://brainly.com/question/5191807

#SPJ1

The percentage of students who scored below 320 is about 0.82%.

To find the percentage of students who scored below 320, we need to use the Z-score formula to find the Z-score for 320 and then use a Z-table to find the proportion of scores below 320.

Z = (320 - 500) / 75 = -3.73

Using a Z-table, we find that the proportion of scores below -3.73 is 0.0002. So, the proportion of scores above 320 is 1 - 0.0002 = 0.9998 or 99.98%.

Therefore, the percentage of students who scored below 320 is 100% - 99.98% = 1.02%. Rounded to the nearest hundredth, this is about 0.82%.

To know more about Z-score, here

https://brainly.com/question/17649506

#SPJ4

The upper bound is 1842 and lower bound is 1692. By using these boundaries and t-table, the sample mean is 1767 and sample standard deviation = 133.98.

Here, the two boundaries are 1692 and 1842.

Mean = (1692+1842) /2 = 1767

Here the degree of freedom, df = (n-1) = 25-1 =24

Margin of error = (1842-1692)/2 = 75

Confidence level = 99%

From the t table, value of T with confidence level 99% and df= 24 is 2.80

The equation for margin of error is M = Ts/√n

            M= 75 , T= 2.80, n =25

75 = (2.80 × s) / √25

75 = 2.80s/ 5

s = (75×5)/2.80 = 133.928 = 133.93

So the sample mean is 1767 and the standard deviation is 133.93.

For more details regarding mean and standard deviation, kindly refer

https://brainly.com/question/16287436

#SPJ4

The perimeter of the polygon is 250m

A polygon is a closed, straight-sided two-dimensional plane shape in geometry. There are no curves on the polygon's surface. The polygon can be divided into two different types, such as regular polygons and irregular polygons, depending on its sides and angles.

The total of a polygon's sides is referred to as the polygon's perimeter. If a polygon has regular sides, its perimeter may be calculated using the formula Perimeter of Regular Polygon = (Number of Sides) x (Polygonal Side Length) units.

Given the sides of the polygon are 10 m, 55 m, 60 m, 90 m, 20 m and 15 m.

The perimeter of the polygon = sum of all sides

The perimeter of the polygon = 10m + 55m + 60m + 90m + 20m + 15 m.

The perimeter of the polygon = 250m

To learn more about perimeter of polygon visit:

brainly.com/question/29129543

#SPJ1

An explicit formula for aₙ, the nth term of the arithmetic sequence is aₙ = 19 - 6(n - 1).

Mathematically, the nth term of an arithmetic sequence can be calculated by using this mathematical expression:

aₙ = a₁ + (n - 1)d

Where:

From the information provided, we have the following parameters:

First term, a₁ = 19

Second term, a₂ = 13

Next, we would determine the common difference as follows:

Common difference, d = a₂ - a₁

Common difference, d = 13 - 19

Common difference, d = -6

Substituting the parameters into the mathematical expression, we have;

aₙ = 19 + (n - 1)(-6)

aₙ = 19 - 6(n - 1).

Read more on arithmetic sequence here: brainly.com/question/24989563

#SPJ1

To correctly label the boxes, you need to perform two operations. In the first operation, you can choose to open any of the three boxes. Regardless of which box you open, you will be able to determine the color of one ball.

Then, you can use that information to deduce which of the other two boxes must contain two balls of the same color and which must contain one ball of each color. In the second operation, you can choose to open the box which contains two balls of the same color. The color of the ball you take out will tell you the correct label of the box. By performing these two operations, you can correctly label the boxes with only two ball selections.

Find out more about Selection

brainly.com/question/29047726

#SPJ4

Answer:

6.0 min

Step-by-step explanation:

20/3=6 remain 2 = 2 x 1min commercial

6 mins long

The number of new cases of a disorder in a population that emerge in a particular time interval is called the incidence.

Incidence refers to the rate at which a new event occurs in a population. Incidence takes into account the variable time period during which a disease-free individual becomes at risk of spreading the disease.

In incident calculations, the quantifier is the number of events that have occurred in a given time. Then the quantifier of the denominator is the population that is at risk of experiencing the event during this period.

Simply put, incidence refers to new cases and is used to determine the etiology of the disease. While prevalence is more widely used to refer to health status in certain populations.

Learn more about incidence at

https://brainly.com/question/13128796

#SPJ1

Answer:

The standard form of a linear equation is Ax+By=C. To change an equation written in slope-intercept form (y=mx+b) to standard form, you must get the x and y on the same side of the equal sign and the constant on the other side.

Step-by-step explanation:

The ratio of drink mix to mixed energy drink is 3:11

8 cups water

3 cups drink mix

We already know the amount of drink mix because the problem gives it to us (3 cups)

As for the amount of mixed energy drink we have to add the two values to get the total.

8 + 3 = 11

Hence the ratio of drink mix to mixed energy drink is 3:11  

hope that helps :)

Answer:

tan(64)= x/11

Step-by-step explanation:

if we make 64 degrees are central angle then that means the side along the right angle is the adjacent and side x is the opposite

since tan∅ = opposite/adjacent

we know angle is 64 and adjacent is 11

thus,

tan 64 = x/11

Answer: (38, 25) or x = 38 and y = 25

Step-by-step explanation:

      We will use the measurement of a straight line and vertical angles to help us solve.

      First, vertical angles are congruent. We will set up an equation and use inverse operations to isolate the x variable.

  Given:

(3x - 33) = (2x + 5)

  Add 33 and subtract 2x from both sides of the equation:

x = 38

      Next, we know a straight line is equal to 180 degrees. We can substitute the value we found above for x. Then we will simplify and use inverse operations to isolate the y variable.

  Given:

(2x + 5) + (4y - 1) = 180

  Substitute for x:

(2(38) + 5) + (4y - 1) = 180

  Simplify:

81 + (4y - 1) = 180

  Subtract 80 (81 - 1) from both sides of the equation:

4y = 100

  Divide both sides of the equation by 4:

y = 25

Answer: The probability of the spinner stopping at a green section and then rolling a 3 is 1/22

Step-by-step explanation: A spinner stopping at a green section

B: rolling a 3

the spinner is divided into 11 parts, 3 of them are green, then:

P(A) = 3/11

the number cube has 6 numbers, then:

P(B) = 1/6

The two events are independent, then:

P(A∩B) = P(A)*P(B) = 3/11 * 1/6 = 1/22

The sample space of the statistical experiment of randomly choosing one of the great lakes from a map is the set of all possible outcomes, which are the five great lakes: Superior, Huron, Erie, Ontario, and Michigan.

A random experiment's sample space S is defined as the set of all potential experiment results. The outcomes of a random experiment, also known as sample points, are mutually exclusive (i.e., they cannot occur simultaneously).

A random experiment's sample space is the collection of all conceivable results. A random experiment's related event is a subset of the sample space. Any outcome's probability is a number between 0 and 1. All of the outcomes have a probability of one.

The sign "S" is used to indicate the sample space. An experiment's events are the subset of conceivable outcomes. Depending on the experiment, a sample area may contain a variety of outcomes.

For more questions on  sample space of statistical experiment

https://brainly.com/question/29053133

#SPJ4

The Equation of parabola is .y = a(x + 9)² + 7

The general equation of a parabola is: y = a(x – h)² + k where (h,k) denotes the vertex. The standard equation of a regular parabola is y² = 4ax.

Given:

The general equation of a parabola is given by

y = a(x – h)² + k

Here (h, k) denotes the vertex.

We have 9 units to the left which is represented by '+9' and 7 units up which is represented by '+7'

So, the Equation of parabola is

y = a(x – h)²

y = a(x + 9)² + 7

Learn more about Equation of parabola here:

https://brainly.com/question/4074088

#SPJ1

[tex]4-\cfrac{2}{3}b+\cfrac{1}{4}a~~ + ~~\cfrac{1}{2}a+\cfrac{1}{6}b-7\implies 4-\cfrac{2b}{3}+\cfrac{a}{4}~~ + ~~\cfrac{a}{2}+\cfrac{b}{6}-7 \\\\\\ \left( \cfrac{a}{4}+\cfrac{a}{2} \right)+\left(-\cfrac{2b}{3} + \cfrac{b}{6}\right)+(4-7)\implies \left( \cfrac{a}{4}+\cfrac{a}{2} \right)+\left( \cfrac{b}{6}-\cfrac{2b}{3} \right)+(4-7)[/tex]

[tex]\left( \cfrac{(1)a+(2)a}{\underset{\textit{using this LCD}}{4}} \right)+\left( \cfrac{(1)b-(2)2b}{\underset{\textit{using this LCD}}{6}} \right)+(-3) \\\\\\ \left( \cfrac{a+2a}{4} \right)+\left( \cfrac{b-4b}{6} \right)-3\implies \left( \cfrac{3a}{4} \right)+\left( \cfrac{-3b}{6} \right)-3 \\\\[-0.35em] ~\dotfill\\\\ ~\hfill {\Large \begin{array}{llll} \cfrac{3}{4}a-\cfrac{1}{2}b-3 \end{array}}~\hfill[/tex]

The dependent variable is the variable that responds to or depends on the treatment and is measured by the researchers.

The dependent variable is also known as the outcome variable, response variable, or dependent measure. The dependent variable is the result that the researchers are interested in observing and understanding the relationship with the independent variable, which is the variable that the researchers manipulate or control in the study. The dependent variable is what the researchers are trying to explain or predict based on the independent variable.

In other words, the value of the dependent variable is dependent on the independent variable.

You can learn more about dependent variable at

https://brainly.com/question/383055

#SPJ4

Answer:

c = 25 * 5^t

Step-by-step explanation:

c = 25 * 5^t

This equation best suits N on the scale as it follows the pattern of the number of colonies being 5 times the previous year.

Image 1: A.

Image 2: B

The definition of a function in mathematics is the confluence of each member of a set (named a domain), to members of another set (named a codomain). The function in question is different from the definition of function in a general sense.

In functions, there are several important terms, including:

Learn more about function in math at

https://brainly.com/question/15096947

#SPJ1

The time when the two companies would cost the same amount is after 3 hours.

Based on the information provided above, beach bikes company charges $10 bike fee and $8 per hour. Therefore, the total cost, y, can be represented by this equation:

y = 8x + 10    .......equation 1.

where:

x represents the number of hours.

For the second option, bikes unlimited charges $5 per hour and a $19 bike fee. Therefore, the total cost, y, can be represented by this equation:

y = 5x + 19    ....equation 1.

By equating equation 1 and equation 2, we have the following:

8x + 10 = 5x + 19

8x - 5x = 19 - 10

3x = 9

x = 9/3

x = 3 hours.

Read more on equation here: brainly.com/question/18912929

#SPJ1

Answer:

x^2 - 6

Step-by-step explanation:

square of a number: x^2

6 is subtracted: -6

A possible equation for F(x) is given as follows:

A. F(x) = 0.4x² + 1.

A translation happens when either a figure or a function are moved horizontally or vertically.

The four translation rules for functions are given as follows:

From this graph, function f(x) is moved up one unit, hence:

F(x) = ax² + 1.

The function f(x) was also vertically compressed, meaning that a < 1, hence:

F(x) = 0.4x² + 1.

More can be learned about translations at brainly.com/question/28174785

#SPJ1

The following is most likely a parameter as opposed to a statistic is registered voters in a county.

A parameter in statistics is any measurable number of a statistical population that summarises or describes some aspect of the population, as opposed to its typical application in mathematics, such as a mean or a standard deviation. A limited collection of factors that perfectly characterise a population and may be used to create a probability distribution for the purposes of taking samples from that population can be assessed if it exactly follows a known and defined distribution, such as the normal distribution.

The family is a parameterized family if the index is also a parameter of its members. The normal distributions, Poisson distributions, binomial distributions, and exponential family of distributions are examples of parameterized families of distributions.

Learn more about Statistical parameter:

https://brainly.com/question/13794992

#SPJ4

The lengths form a right triangle are Triangle 2,3 and 4.

Side lengths a , b , c form a right triangle if, and only if, they satisfy a² + b² = c² . We say these numbers form a Pythagorean triple.

The Pythagorean theorem reads:

"In a right triangle, the square of the hypotenuse equals the sum of the squares of the other sides."

Thus the three sides of a right triangle have an interrelated relationship.

This theorem has two mandatory properties, namely it only applies to right triangles and you must know at least two sides first to be able to determine the other side.

While the purpose of this theory is basically to determine the length of one side of a right triangle. Whereas for a right triangle it is actually very easy because one of the characteristics of a right triangle is that it has one of the 90° angles.

However, this theory can also be used to calculate the length of the diagonal of a square or beam and cube which also looks like a right triangle.

Learn more about Pythagorean theorem at

https://brainly.com/question/16443850

#SPJ1

Answer:

72⁰

Step-by-step explanation:

180-36= 144 (angles in a triangle=180)

144/2=72 (parallel lines are equal)