Question

(02.02)

Answer 1

We are given the equation $P = (20 + 0.5x) + 0.15(20+0.5x)$

"Jennifer wants to purchase a book but only has $62.10 to spend."
This means that our $P = 62.10$ 

Plug this in and we get
$62.10 = (20+0.5x) + 0.15(20+0.5x)$
Now all we have to do is solve for $x$

distribute the 0.15 in the second set of parenthesis and get
$62.10 = 20 + 0.5x + 3 + 0.075x$

then add like terms on our right side and get
$62.10 = 23 + 0.575x$

then subtract 23 from both sides
$39.1 = 0.575x$

then divide both sides by 0.575
$x = 68$


Therefore your answer is $x = 68$ pages.