Write the phrase as an algebraic expression. Let x represent the unknown number.Nine subtracted from a number
A. x + 9
B. 9x
C. 9 - x
D. x - 9
Answer: D
Mathematics
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Solve the problem.A spherical water tank with an inner radius of 10 m has its lowest point 1 m above the ground. It is filled by a pipe that feeds the tank at its lowest point (see figure). Neglecting the volume of the inflow pipe, how much work is required to fill the tank if it is initially empty? Express the answer in terms of ?. 
A. 
? J
B. 
? J
C. 
? J
D. 
? J
Mathematics
Solve.m - 4 ? -2
A. m ? 6 B. m ? 2 C. m ? -2 D. m ? -6
Mathematics
Perform the indicated operations and simplify the result. Leave the answer in factored form.
A. 3x + 13
B. 
C. 7
D. 21
Mathematics
Multiply and simplify.
? 
A. 1
B. 
C. -1
D. 0
Mathematics