wolflover18 wolflover18

17-05-2016
Mathematics

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Angle x is (2n + 12)°, and angle y is (3n + 18)° . Find the measure of angle x.

Note: not drawn to scale.
A) 24°
B) 30°
C) 72°
D) 108

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apologiabiology apologiabiology

17-05-2016

angles add to 180 since assume straighe line

x+y=180
x=2n+12
y=3n+18

2n+12+3n+18=180
5n+30=180
minus 30
5n=150
divide 5
n=30

sub back
x=2n+12
x=2(30)+12
x=60+12
x=72 degrees

C

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