Level 2
Given the proportional table on the right, create an equation in the form
y = kx where k represents the unit rate of cost per sheet of stickers.
Costs of Stickers
Number of
Cost in
Sheets (x) Dollars (y)
7
16.45
21.15
13
30.55
19 I 44.65
9

Aswimming pool has an input pump for filling the pool and an output pump for emptying the pool. the input pump can fill the pool in 3 hours, and the output pump can drain the pool in 5 hours. as you go to bed, the pool is full, but a neighbor’s kid turns on the output pump. at midnight, you awake to find the pool half empty. immediately, you turn on the input pump, but you are sleepy and forget to turn off the output pump. at what time will the pool become full?

33% of college students say they use credit cards because of the rewards program. you randomly select 10 college students and ask each to name the reason he or she uses credit cards. find the probability that the number of college students who say they use credit cards because of the rewards program is (a) exactly two, (b) more than two, and (c) between two and five inclusive. if convenient, use technology to find the probabilities.

The sum of the squares of two numbers is 8 . the product of the two numbers is 4. find the numbers.