Question

Please help me in Geometry

Answer 1

B) ( 9 + 12a ) + ( 3a + 7 ) = 76

Let us solve this equation :-

= ( 9 + 12a ) + ( 3a + 7 ) = 76

= 9 + 15a + 7 = 76

= 16 + 15a = 76

$15a = 76 - 16$

$15a = 60$

$a = \frac{60}{15}$

$a = 4$

Let us check whether it is correct or not :-

= ( 9 + 12 × 4 ) + ( 3 × 4 + 7 ) = 76

= 57 + 19 = 76°

Therefore , the correct option is :-

B) ( 9 + 12a ) + ( 3a + 7 ) = 76