Question

1. a (5x - 27)° b (7x - 26)° c (10x - 23)° x = 15 m∠a = 48°

Explanation:

Step1: Substitute x = 15 into angle A's expression

We know that the measure of angle A is given by the expression $(5x - 27)^{\circ}$. Substitute $x = 15$ into it.
$5x-27=5\times15 - 27$

Step2: Calculate the value

First, calculate $5\times15=75$. Then, $75-27 = 48$.
$5\times15-27=75 - 27=48$

Answer:

$48^{\circ}$