X+y=9
xy=7
(simultaneous equations) solve

the answer would be 150 books

step-by-step explanation:

if you divide 300 by 2 you will get 150

company a

step-by-step explanation:

using the linear regression models , it is found that company a   pays about $14 more. but using the same regression (linear) company b pays about $10 more.

so company a pays more than b

d 600 because 15*10*2=300

300+300=600

step-by-step explanation:

you need to add a picture