N1917 the cost of a first-class postage stamp was 3¢. in 1974 the cost for a first-class postage stamp was 10¢. what is the percent of increase in the cost of a first-class postage stamp?

233.33 %.

Step-by-step explanation:

The increase is 10 - 3 = 7c.

Percentage increase =  100 * 7 / 3.

= 700 / 3

=  233.33 %.

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value

answer: 42

use a calculator to find that 845/73 = 11.575

the whole part of the answer is 11. multiply this by 73 to get 11*73 = 803.

subtract that result from 845 to get 845 - 803 = 42