Which equation could be used to solve problems involving the relationships between the angles?

A. 90 + (8a + 9) = (11 + 2a)
B. 90 − (8a + 9) = (11 + 2a)
C. (11 + 2a) − 90 = (8a + 9)
D. (8a + 9) − (11 + 2a) = 90

Given this information, which expression must represent the value of b?

Prove the divisibility of the following numbers: 25^9 + 5^7 is divisible by 30.also, read as (25 to the power of 9) + (5 to the power of 7) is divisible by 30. blank x 30what is the blank? ( it should be expressed in exponent form)

Pls brainliest will be awarded if answer is correct