The base of a solid right pyramid is a square with an edge length of n units. The height of the pyramid is n - 1 units. Which expression represents the volume of the pyramid? 1/3n(n − 1) units^3
1/3n(n – 1)^2 units^3
1/3n^2(n − 1) units^2
1/3n^3(n − 1) units^3

i think the length is 12 and the width is 17

there are infinitely many solutions.

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