The question is missing alternatives. The complete question is here.
For each student in a certain class, a teacher adjusted the student's test score using the formula y = 0.8x + 20, where x is the student's original test score and y is the student's adjusted test score. If the standard deviation of the original test scores of the students in the class was 20, what was the standard deviation of the adjusted test scores of the students in the class?
A. 12
B. 16
C. 28
D. 36
E. 40
Answer: B. 16
Step-by-step explanation: If you add a constant to each number at the data set, standard deviation doesn't change. However, multiplying each data in the data set by a constant, also multiplies the standard deviation by that constant.
That being said, the formulafor the adjusted test score is
y = 0.8x + 20
Adding 20 to each data doesn't change standard deviation but multiplying by 0.8 changes it.
So, the new standard deviation is
σ = 20*0.8 = 16
Standard Deviation for the adjusted test scores of the students is 16.
Melissa has three different positive integers. She adds their reciprocals together and gets a sum of $1$. What is the product of her integers?Melissa has three different positive integers. She adds their reciprocals together and gets a sum of $1$. What is the product of her integers?
Answer:
One possible answer is 0,1,1
Step-by-step explanation:
-1x-1 is 1
¿Cuál es la suma de los ángulos 1 al 6 en este paralelogramo?
Answer:
Un paralelogramo es una forma plana con lados opuestos paralelos y de igual longitud.
Step-by-step explanation:
Los ángulos "a" y "b" suman 180 °, por lo que son ángulos suplementarios. NOTA: ¡Los cuadrados, rectángulos y rombos son todos paralelogramos
Espero que esto te ayude :)
Olivia decides to hire an electrician. The electrician charges $35 to come out to Olivia's
home, and $60 an hour for work. This is modeled by
C (2) = 35+ 60x . Explain what C (5) = 335 means in terms of total cost and
number of hours.
help plz
Answer:
Step-by-step explanation:
Total cost
C (x) = 35+ 60x
Where,
Fixed cost= $35
Variable cost = 60x
x= number of hours of work
Total cost is the addition of fixed and variable cost
C (x) = 35+ 60x
C(5)= 35 + 60(5)
= 35 + 300
=335
C(5) = 335
C(5) = 335 is Olivia's total cost of hiring the electrician
x=5 is the electrician's number of hours of work
35= fixed cost of hiring the electrician
60(5) = 300 is the variable cost of hiring the electrician for 5 hours
Which statement is true about the end behavior of the function represented by the graph?
As x approaches 1, f(x) approaches 25.
As x approaches −∞, f(x) approaches −∞, and as x approaches ∞, f(x) approaches −∞.
As x approaches −∞, f(x) approaches −4, and as x approaches ∞, f(x) approaches 7.
As x approaches −∞, f(x) approaches −∞, and as x approaches ∞, f(x) approaches ∞.
End behavior always involves x approaching positive and negative infinity. So we'll cross off the choice that says "x approaches 1".
The graphs shows both endpoints going down forever. So both endpoints are going to negative infinity regardless if x goes to either infinity.
Answer: Choice BAs x approaches −∞, f(x) approaches −∞, and as x approaches ∞, f(x) approaches −∞.Another way to phrase this would be to say "f(x) approaches negative infinity when x goes to either positive or negative infinity"
End behavior always involves x approaching positive and negative infinity. So we'll cross off the choice that says "x approaches 1".
The graphs shows both endpoints going down forever. So both endpoints are going to negative infinity regardless if x goes to either infinity. (Option B)
What is end behavior in graphs?End behavior refers to the behavior of a graph as the x-values approach positive or negative infinity.
It describes how the graph behaves at the far left and far right ends.
End behavior can be categorized as increasing or decreasing, and it helps understand the long-term trend or direction of the graph.
Learn more about end behavior at:
https://brainly.com/question/12619590
#SPJ2
Mario completely covered a square floor using 98.5 ft ^2 of hardwood without any overlap
Which measurement is closest to the side length of this floor in feet?
9.5 ft
10 ft
25 ft
49 ft
The answer is 10 ft. I took the test but it didn't explain why it was the answer.
How do you solve x+(2x + 40) + (3x - 50) = 15002
Answer:
First, combine like terms by combining the variables and constants. Then use properties of equality to isolate the variable and find the value for x.
Step-by-step explanation:
sample response from ed2020
Explain why the following statements are equivalent: x + (y + 9) = (x + y) + 9
Answer:
There are no like terms hence they stay the same
Step-by-step explanation:
x + (y + 9)
There are no like terms
=x+y+9
(x + y) + 9
There are no like terms
=x+y+9
Answer:get into it
Step-by-Stefan:
In between what two integers is the \large \sqrt{77}
Answer:
8 and 9
Step-by-step explanation:
Since 77 is between 64= 8² and 81= 9²
√64 < √77 < √818 < √77 < 918. Danny rolls two number cubes (dice), one red and one blue.
What is the probability that he will roll a 2 on the red cube
and a 6 on the blue cube?
a) 1
b) 2 .
6
15
c) 1
d) 1
18
36
Answer:
1/36
Step-by-step explanation:
1/6 * 1/6 = 1/36
I could really use some help with this problem. The file is attached below. Thanks!
Answer:
Step-by-step explanation:
8x³ + 2x² -20x - 5
= (8x³ + 2x²) + (-20x - 5)
= 2x² (4x + 1) + (-5)(4x + 1)
= (2x² - 5)(4x +1 )
How many pennies could you have if: When you Break de Pennies into groups of 2, you have 1 penny left over, AND when you break the pennies into groups of 3, and you have 1 penny left over, AND when you break the pennies into groups of 5, you have 1 penny left?
Answer:
The answer is 31 pennies
Step-by-step explanation:
we have to find a number that gives a remainder of 1 when divided by both 2, 3 and 5.
The easiest way to do this is to list the factors of 5, add 1 to it, and test them until we find the one with a remainder of 1 by all three divisors. This is done as follows:
1) factor: 5 (+1) = 6
6 ÷ 2 = 3 remainder 0
6 ÷ 3 = 2 remainder 0
since there is a remainder of 0, when divided by 3, 6 is wrong
2) factor; 10 (+1) = 11
11 ÷ 3 = 3 remainder 2 ( 11 is not the correct answer
3) factor : 15 (+1) = 16
16 ÷ 2 = 8 remainder 0 ( 16 is not the correct answer
4) factor : 20(+1) = 21
21 ÷ 3 = 7 remainder 0 ( 21 is wrong)
5) factor : 25(+1) = 26
26 ÷ 2 = 13 remainder 0 ( 26 is wrong)
6) factor : 30(+1) = 31
31 ÷ 2 = 15 Remainder 1
31 ÷ 3 = 10 Remainder 1
31 ÷ 5 = 6 Remainder 1
since all three divisors give a remainder of 1, the correct answer is 31
Therefore you have 31 pwnnies
Hellllllllpppppppppppppppppp
Answer:
7/9
Step-by-step explanation:
Since a negative times a negative is positive, -(-1) becomes + 1 so the expression becomes -2/9 + 1. Using the commutative property of addition (a + b = b + a), we can rewrite this as 1 - 2/9. 1 = 9/9 so the expression becomes 9/9 - 2/9 = 7/9.
If it is 50 degrees outside and the temperature will drop 17 degrees in the next six hours, how cold will it get?
Answer:
it will drop to 33 degrees
Answer:
33 degrees
Step-by-step explanation:
Take the temperature and subtract 17 degrees
50 -17
33 degrees
Given that (y+2), (y+3)and (2y^2+1) are consecutive terms of an arithmetic progression find the value of x
Answer:
In an arithmetic sequence, the difference between any consecutive terms should be always the same, then we have:
(y + 3) - (y + 2) = D
(2*y^2 + 1) - (y + 3) = D.
From the first equation, we can find the value of D:
y + 3 - y - 2 = D
1 = D.
Replacing this in the second equation, we have:
(2*y^2 + 1) - (y + 3) = 1
Now we can solve this equation:
2*y^2 + 1 - y - 3 - 1 = 0
2*y^2 - y - 3 = 0.
The solutions of this quadratic equation can be found with the Bhaskara's equation:
[tex]y = \frac{1 +- \sqrt{1^2 - 4*2*(-3)} }{2*2} = \frac{1+-\sqrt{25} }{4} = \frac{1+-5}{4}[/tex]
Then the possible values of y are:
y = (1 + 5)/4 = 6/4
y = (1 - 5)/4 = -1
What is the actual distance around the garden?It took Clare 30 minutes to walk around the garden at a constant speed
Answer:
f she walks for 30 minutes, that means she was traveling at about 280 feet per minute (8,400÷30=280), or about 16,800 feet per hour
Step-by-step explanation:
help!! Will mark brainliest! Thank you
Answer:
34
Step-by-step explanation:
7y - 3x
7(4) - 3(-2)
28-(-6)
34
Please help on 5 to be marked the brainliest
Answer:
3,200
Step-by-step explanation:
Answer:
4000
Step-by-step explanation:
3200 x 250 = 800,000 x 0.1 = 80,000
4000 x 250 = 1,000,000 x 0.1 = 100,000
4200 x 250 = 1,050,000 x 0.1 = 105,000
5000 x 250 = 1,250,000 x 0.1 = 125,000
Pls halp due today >_<. Thank you
Answer:
<
Step-by-step explanation:
Step 1: Evaluate 2√40
2√40 = 12.6491
Step 2: Evaluate 7 + √63
7 + √63 = 14.9373
Step 3: Fill in inequality symbol
12.6491 < 14.9373
(3x+6) + (5x - 7) =
Answer:
8x - 1Step-by-step explanation:
(3x+6) + (5x - 7) =3x+6 + 5x - 7=3x +5x +6 - 7=8x - 1Hope this helps.. Good luck!
square root of -19 in terms of i
Answer:
i√19
Step-by-step explanation:
Because √(-19) = √(-1)√19, and because √(-1) = i, we get i√19
Joan saved $2.34 on an item that is usually $7.89. What percent did she save
1 Let a = 5.2 and b = 4.7.
a Find the exact value of 3a + b3.
Xena estimates that the answer to part a is 140.
b Find the percentage error made by Xena in her estimation.
Part (a)
Replace every 'a' with 5.2 and replace every 'b' with 4.7
Then use your calculator to evaluate.
3a + b^3 = 3*5.2 + (4.7)^3 = 119.423
Answer: 119.423===============================================
Part (b)
The true value is 119.423 which is the result of part (a)
The estimated value is 140
Subtract the two values
140-119.423 = 20.577
and divide that over the true value
20.577/140 = 0.14697857142858
Which, when rounded to 4 decimal places, we get 0.1470
Move the decimal place over to the right 2 spots to get 14.70%
Answer: 14.70% error (approximate)The direction angle of a vector is 135o. The x-component of the vector is -3. What is the y-component of this vector
Answer:
3
Step-by-step explanation:
the vector somewhat looks like this:
^
_\|_ the angle is 135 degrees, and the x component is -3
| To find the y component given the direction angle and x component, use the formula y_comp = tan(angle) * x_comp
tan (135 degrees) * -3 = 3
You can also use the graph and geometry, but that method is not recommended for beginners as it is very easy to make a mistake. The graph should be used to check if your answer makes sense.
PLEASE HELP HELP ASAP
Answer:
12.7311111111111 on and on
Step-by-step explanation:
Answer:
the height of the cylinder is 40 meters
Step-by-step explanation:
Use the formula they give you for the volume, and the fact that it has to equal 1000 [tex]\pi[/tex] cubic meters. Recall also that the cylinder's radius is 5 meters:
[tex]Vol=\pi\,R^2\,h\\1000\,\pi= \pi\,(5)^2 \,h\\1000\,pi=\,\pi\,25\,\,h\\h=1000\,\pi/(25\,\pi)\\h=40 \,\,m[/tex]
-3+8x-5=-8 Choices: A. -2 B. -1 C. -3/4 D. 0
Answer:
D.0
Step-by-step explanation:
Question 12
What is the length of a segment with endpoints at (-3, 4) and (4, 4)?
Answer:
7 units. count from -3 to 4 on a number line
Step-by-step explanation:
Answer:(4,5)
Step-by-step explanation:
What is the domain of the function represented by the graph?
Answer:
I believe its c
Step-by-step explanation:
The domain of a quadratic function is all real numbers
Answer:
See Below
Step-by-step explanation:
If tan fº = 2/1 and the measure of yw is 8 units, what is the measure of xw?
2units
4units
7units
8 units
*see attachment for the figure referred to
Answer:
4 units
Step-by-step explanation:
Given that [tex] tan(f) = \frac{2}{1} [/tex], therefore, it follows that:
[tex] tan(f) = \frac{opp}{adjacent} = \frac{YW}{XW} = \frac{8}{XW} [/tex],
If the ratio of YW to XW = 2:1, therefore, [tex] \frac{2}{1} = \frac{8}{XW} [/tex]
Cross multiply to find XW
[tex] XW*2 = 8*1 [/tex]
[tex] XW = \frac{8}{2} = 4 units[/tex]
Answer:
the answer is B
Step-by-step explanation:
I took the test and got it right
Joe bought a box of laundry detergent that contains 195 scoops. Each load of laundry
2 scoops. How many loads of laundry can he do with this one box? The box of
detergent was $19.99. How much is he paying for each load that he washes?
uses
Answer:
at least 97 loads
Step-by-step explanation:
What is the curved surface area of a cylinder with radius 8cm and height 15cm 754.29cm 574.92cm 354.29cm 624.29cm
Answer:
Below.
Step-by-step explanation:
This area = circumference of the base x height
= 2 * pi * 8 * 15
= 754.29 cm^2.
Answer:
The answer is 754.29cm^2
Step-by-step explanation:
radius= 8 cm
height= 15 cm
This is an area question
The formula to calculate the curved surface area will be,:
2 pile r times h which will be = to: 2 pile r h
2 x 22/7/3.14 x the radius which is 8 x height which is 15.
2 x 22/7 x 8 x 15 =
754.29 cm^2.
Okay.