Review and remember
round each number to the place underline
16. 598.38
17. 228.349
20. 19,736.4
21. 172.56
silver burdett ginn in

b

step-by-step explanation:

u take $75 minus $60.the anwer/original($75)multiply by 100

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