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Debora [2.8K]
2 years ago
6

Pls answer what you can and I will give brainliest.

Mathematics
1 answer:
belka [17]2 years ago
5 0

Answer:

I believe the top one is true! I'm sorry I couldn't answer them all :c

Step-by-step explanation:

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If the coefficient of correlation is .8, then the percentage of variation in the dependent variable explained by the estimated r
Olegator [25]

Answer:

64%

Step-by-step explanation:

The percentage of variation in the dependent variable explained by the estimated regression is calculated with the coefficient of correlation as follows:

First, square the coefficient of correlation: 0.8^2 = 0.64

And then, multiply this result by 100, so that, it is expressed as a percentage: 0.64*100 = 64%

3 0
3 years ago
What are the measures of Angles a, b, and c? Show your work and explain your answers.
andreev551 [17]
Answers: ∠a = 30° ; ∠b = 60° ; ∠c = 105<span>°.
</span>_____________________________________________
1) The measure of Angle a is 30°. (m∠a = 30°).
Proof:  All vertical angles are congruent, and we are shown in the diagram that angle A — AND the angle labeled with the measurement of 30°— are vertical angles. 

2) The measure of Angle b is 60°. (m∠b = 60<span>°).
Proof:  All three angles of a triangle add up to 90 degrees. In the diagram, we can examine the triangle formed by Angle A, Angle B, and a 90</span>° angle. This is a right triangle, and the angle with 90∠ degrees is indicated as such (with the "square" symbol).  So we know that one angle is 90°.  We also know that m∠a = 30°.  If there are three angles in a triangle, and all three angles must add up to 180°, and we know the measurements of two of the three angles, we can solve for the unknown measurement of the remaining angle, which in this case is: m∠b.  
 90° + 30° + m∠b = 180<span>° ;
</span>180° - (<span>90° + 30°) = m∠b ; 
</span>180° - (120°) = m∠b = 60<span>°
</span>___________________________
Now we need to solve for the measure of Angle c (<span>m∠c).
___________________________________________
All angles on a straight line (or straight "line segment") are called "supplementary angles" and  must add up to 180</span>°.  As shown, Angle c is on a "straight line".  The measurement of the remaining angle represented ("supplementary angle" to Angle c is 75° (shown on diagram).  As such, the measure of "Angle C" (m∠c) = m∠c = 180° - 75° = 105°.
6 0
3 years ago
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PLS HELP ASAP THIS IS DUE TODAY AND IM JUST NOW REMEMBERING IT
ANTONII [103]

<em>i think it's just simply</em> y - 7 <em>?</em>

7 0
3 years ago
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Can you help <br> please and thank you
seraphim [82]

Answer:

C

Step-by-step explanation:

Total of 40 cups and 25 of them are chocolate so the proportion for chocolate would be 25/40

7 0
2 years ago
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PLEASE HELP ME I FORGOT HOW TO DO THIS PLZ SHOW THE WORK TOO
Cerrena [4.2K]
Substitute the input (x) numbers for x . Example: y= 5x substitute -3 for  X 
5 x -3 = -15. So there's your first answer for the first chart. 
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3 years ago
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