Item 21
You know that 15% of a number n is 12. How can you use this to find 30% of n? 45% of n? Explain.

Because 30% of n is equal to
times 15% of n and 45% of n is equal to
times 15% of n, you can write

30% of n=
×12=

and

45% of n=
×12=
.

Solve the system of equations. y= 2x y= x^2 - 15

How many of the 250 grandparents in the population would you expect to prefer online shopping with merchant a? merchant a: 4 merchant b: 6 merchant c: 2 merchant d: 3 other: 5 none: 5 answer choices: a. about 4 b. about 8 c. about 40 d. about 21

Solve for x. −3/4(x+2)=6 enter your answer in the box