Can anyone answer these questions

see explanation

see explanationStep-by-step explanation:

21

Note that

(a - )²

= a² - 2 +

= a² + - 2

= 11 - 2

= 9

Thus

(a - )² = 9 ( take the square root of both sides )

a - = 3

22

Since the expression is a perfect square, then

(4x + 5y)²

= 16x² + 40xy + 25y²

Comparing coefficients, then

a - 1 = 40 ( add 1 to both sides )

a = 41

23

99² - 87² ← is a difference of squares and factors as

= (99 - 87)(99 + 87)

= 12 × 186 = 1152, thus

24a = 1152 ( divide both sides by 24 )

a = 48

answer: get jesus in your life

step-by-step explanation:

a) 0

step-by-step explanation:

i^413 x i^0 = 0 as any number multiplied by a zero is

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