Ayanna is 17 and Brittany is 14.
To find this, let's write two equations using the given information.
a = b + 3
3b + 2a = 76
Now, just substitute the first equation into the second and solve.
3b + 2(b + 3) = 76
3b + 2b + 6 = 76
5b = 70
b = 14
If Brittany is 14, then Ayanna is 3 years older at 17.
Answer:
The predicted life expectancy of men in a country in which the life expectancy of women is 70 years is 65.33 years.
Step-by-step explanation:
The least square regression line is used to predict the value of the dependent variable from an independent variable.
The general form of a least square regression line is:
![\hat y=\alpha +\beta x](https://tex.z-dn.net/?f=%5Chat%20y%3D%5Calpha%20%2B%5Cbeta%20x)
Here,
<em>y</em> = dependent variable
<em>x</em> = independent variable
<em>α</em> = intercept
<em>β</em> = slope
The regression line to predict the life expectancy of men in a country from the life expectancy of women in that country is:
![\hat y=3.73 +0.88 x](https://tex.z-dn.net/?f=%5Chat%20y%3D3.73%20%2B0.88%20x)
Compute the life expectancy of men in a country in which the life expectancy of women is 70 years as follows:
![\hat y=3.73 +0.88 x](https://tex.z-dn.net/?f=%5Chat%20y%3D3.73%20%2B0.88%20x)
![=3.73 +(0.88\times 70)\\=3.73+61.6\\=65.33](https://tex.z-dn.net/?f=%3D3.73%20%2B%280.88%5Ctimes%2070%29%5C%5C%3D3.73%2B61.6%5C%5C%3D65.33)
Thus, the predicted life expectancy of men in a country in which the life expectancy of women is 70 years is 65.33 years.
I want to say the answer is a or b mostly a though