A family travels 613.4 miles. In 11.5 hours. Estimate the numer of miles they can travel in an hour

this may not be at all, but i use the same website you're using for school, and if i'm stuck doing one of these i try to look for it on the section.

probably .5

i can on others if necessary.

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