Problema Solution
to mail a first class letter, the U.S. Postal Service charges $0.49 for the first ounce and $0.21 for each additional ounce. It costs $1.12 to mail your letter. How many ounces does your letter weigh?
Answer provided by our tutors
let 'x' represent the weight of the letter in ounces
0.49 + (x - 1)0.21 = 1.12
by solving we find
x = 4 oz
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the letter weights 4 ounces.