Write the algebraic expression described. Simplify if possible.
-The sum of the angles of a triangle is $180 ^ { \circ }$. If one angle of a triangle measures $x ^ { \circ }$ and a second angle measures $( 9 x + 18 ) ^ { \circ }$, express the measure of the third angle in terms of $x$.
A) $( 198 - 10 x ) ^ { \circ }$
B) $( 162 - 9 x ) ^ { \circ }$
C) $( 162 - 10 x ) ^ { \circ }$
D) $( 162 + 10 x ) ^ { \circ }$

Question

Quizplus · Accepted Answer

The sum of the angles of a triangle is $180 ^ { \circ }$. So, the third angle is $180 ^ { \circ } - x ^ { \circ } - ( 9 x + 18 ) ^ { \circ }$. Simplifying, we get $180 ^ { \circ } - x ^ { \circ } - 9 x - 18 ^ { \circ }$, which is equal to $162 ^ { \circ } - 10 x ^ { \circ }$.

Write the Algebraic Expression Described 180∘180 ^ { \circ }180∘ If One Angle of a Triangle Measures

Write the Algebraic Expression Described $180 ^ { \circ }$ If One Angle of a Triangle Measures