Answer:


Step-by-step explanation:
Hope this helps!
Answer:
<em>( 8, - 2 )</em>
Step-by-step explanation:
R(t) = 4t
A(r) = π(r^2)
a) A(t) = A[r(t)] = π[r(t)]^2 = π[4t]^2 = 16π(t^2)
b) t = 4,
A(4) = 16*3.14*(16)^2 = 12,861.44
15 x 25 = 375
15 x 50 = 750
375 + 750 = 1,125
She has 1,125 books.
I wish I could help but but I can't I'm dumb as a box of rocks