How do I work this out

Mathematics

1 answer:

gregori [183]3 years ago

4 0

P = a + b + c where a < b < c

P = 42 in
b = 18 in
a = x
c = 4x - 1

The equation:

x + 18 + 4x - 1 = 42 |combine items

5x + 17 = 42 |subtract 17 from both sides

5x = 25 |divide both sides by 5

x = 5 (in)

c = 4 · 5 - 1 = 20 - 1 = 19 (in)

Answer: The length of the longest side is 19 in.

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