Which values of x are solutions to the equation below? Check all that apply. 3x2 - 42 = 33
A. x = -4
B. x = 5
C. x = 4
D. x = -5
E. x =sq 15
F. x = -sq 15

answer: 48

just remember to use pemdas:

parentheses

expressions

multiplication

division

addition

subtraction

this is a direct variation proportion. y = kx

y is the total amount due, k is the constant of variation, and x is the number of texts sent.

plug in the 3.20 and the 16 to solve for the "k". this is the constant of proportionality. it is the value that will not change.

3.20 = k(16). solving you get $.20 per text.

the equation would then be y = .20x