Answer:
a) 
b) y = 289.815
Step-by-step explanation:
We are given the following information:
The estimate regression equation for a model involving two independent variables and 10 observations follows:

where
are the two independent variable and y is the dependent variable.
a) The regression line is of the form:

Comparing, we get,

These are the coefficients of
respectively, and helps us to know the the significance of the independent variable in predicting the independent variable.
b) We have to estimate y when

Answer:
Since both terms are perfect squares, factor using the difference of squares a^2-b^2=(a+b)(a-b) where a=5x and b=4y
(5x+4y)(5x-4y)
Idk if this is serious... but 10....
Answer:
3.5.
Step-by-step explanation:
Splitting 7 in half = 3.5.
Hope this helps.