Write the phrase as an algebraic expression. Let x represent the unknown number.thirteen times a number
A. -13x
B. 13 ÷ x
C. 13x
D. 13+ x
Answer: C
Mathematics
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Evaluate the exponential form.90
A. 1 B. -1 C. 9 D. 0
Mathematics
Provide an appropriate response.The graph of the equation y = -4x2 + 9x - 10 opens 
.
A. downward B. to the right C. to the left D. upward
Mathematics
Determine whether the given point is in the solution set to the given system.(2, 9, -4)2x - 5y - 9z = -5 x + y + z = 73x - y + 5z = 35
A. No B. Yes
Mathematics
Evaluate the expression.22 ÷ 
A. 121 B. 22 C. 11 D. 4
Mathematics