need help for two math problems in SAT?

Test Preparation SAT Preparation
1

<p>Two questions in SAT?
The attendance at a school play increased by 30 percent from Friday to Saturday, and then decreased by 5 percent from Saturday to Sunday. Sunday's attendance was what percent of Friday's attendance?
A) 120%
B) 122%
C) 123.5%
D) 125%
E) 126.5%</p>

<p>The function h is defined by h(x)=5x+8. If 1/3h(radical r)= 4, what is the value of r?
A) 16/25
B) 4/5
C) 2/ radical 5
D) 4
E) 16</p>

<p>Please show work and how you got there so I can understand. Thanks a lot.</p>

2

<p>For the first one, assume that 100 people attended on Friday. That would mean 130 attended on Saturday. Then the attendance went down by 5% of 130, or 6.5. This isn’t actually possible, but if 123.5 people could attend on Sunday, that would be 123.5% of the Friday night audience.</p>

<p>For the second one, I assume you’re saying (1/3)*h(square root of r) = 4.</p>

<p>Then h(sqrt r) = 12
5(sqrt r) + 8 = 12
5(sqrt r) = 4
(sqrt r) = 4/5</p>

<p>now square both sides</p>

<p>r = 16/25</p>