Find the natural number b that makes the expression a perfect square trinomial.x2 + 6x + b
A. 6
B. 36
C. 9
D. 3
Answer: C
Mathematics
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Subtract.-18 - (-3)
A. 15 B. 21 C. -15 D. -21
Mathematics
Use the sum/difference identities to simplify the expression. Do not use a calculator.cos (-15°) cos 75° + sin (-15°) sin 75°
A. 
B. -1
C. 0
D. 1
Mathematics
Tell which set or sets the number belongs to: natural, whole, integer, rational, irrational, real.-0.9494. . . (the block 94 repeats)
A. real, irrational B. real C. real, rational, natural D. real, rational
Mathematics
Use factoring and the root method to solve the polynomial equation.x4 - 6x2 + 9 = 0
A. 3
B. -
, 
C. -3, 3
D. 
Mathematics