If the ratio of the areas of two similar polygons is 32: 50, what is the ratio of the corresponding side lengths?

a.
4: 5
b.
16: 25
c.
32: 50
d.
1,024: 2,500

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