Question 1168863
equation would be y = .28 + .21 * x for x = integer >= 1
x = number of ounces.
y = total cost


if x = 1, cost is .28 + .21 * 1 = .49
if x = 2, cost is .28 + .21 * 2 = .70
if x = 3, cost is .28 + .21 * 3 = .91
etc.


to find the cost for mailing a letter, calculate the number of ounces and then use the equation to find the costs.


if you want to send 4 ounces, the cost would be y = .28 + 4 * .21 = 1.12