The scale factor of figure STUV to WXYZ is 3:1. If ST=78mm and SV=102mm, what is the length of side WZ

you need to add a picture

i need points

step-by-step explanation:

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