Which pair of expressions is equivalent for any variable value greater than zero? ] a. 4(x+3) and 4x+3
b. 5d+3e and 8d+e
c. r+r+r+k and 3rk
d. a+a+4s and 2a+4s

im sorry but no. i just need to answer for 50 poonts oof

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

did you get the answer?

im not sure of the names, but the answer is 48