Write the algebraic expression described.
-A quadrilateral is a four-sided figure whose angle sum is 360°. If one angle measures x°, a second angle measures 4x°, and a third angle measures 9x°, express the measure of the fourth angle in terms of x.
A)(360 - 14x)°
B)(360 - 13x)°
C)(14x - 360)°
D)(360 + 14x)°

Question

Quizplus · Accepted Answer

The sum of the angles in a quadrilateral is 360°. Given three angles as x°, 4x°, and 9x°, the sum of these three angles is x + 4x + 9x = 14x°. Therefore, the fourth angle = 360° - 14x°.

Write the Algebraic Expression Described