Find two numbers whose ratio is 3 to 1 such that the difference of their squares is to their sum as 6 is to 1. What are the two numbers? a. 3 and 9
b. 1/2 and 1/6
c. 1/3 and 1/9
d. 6 and 18
d. 9 and 27

Erin bought christmas cards for $2 each to send to her family and friends. which variable is the dependent variable?

The input to the function is x and the output is y. write the function such that x can be a vector (use element-by-element operations). a) use the function to calculate y(-1.5) and y(5). b) use the function to make a plot of the function y(x) for -2 ≤ x ≤ 6.

What is the geometric mean of 3 and 7? a) square root of 21 b) 2 square root of 6 c) 2 square root of 7 d) 21