Solve.


5 (2 does not check)

Mathematics

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Solve by completing the square.x2 - 12x - 13 = 0

A. -1, 13
B. ± 
C. -1, -12
D. -13, 1

Mathematics

Find the phase shift of the function.y = -3 cos (4x + ?)

A. 3? units to the right
B.  units to the left
C. 4? units to the right
D.  units to the left

Mathematics

Multiply and simplify.27 ? 

A. 15
B. 20
C.
D.

Mathematics

Write a numerical expression for the phrase and simplify it.12 less than -9

A. 12 - (-9); 21 B. -9 - 12; -21 C. 12 - 9; 3 D. -9 - 12; 21

Mathematics