Write the phrase as a mathematical expression. Use x as the variable.Twice some number
A. 2 + x
B. 2x
C. 
D. 2 - x
Answer: B
Mathematics
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Integrate the function f over the given region.f(x, y) = 
over the region bounded by the x-axis, line 
and curve 
A. 6 B. 8 C. 1 D. 7
Mathematics
Identify the unknown amount as the portion, rate, or base.50% of what number is 54?
A. rate B. portion C. base
Mathematics
Simplify the expression. Express the answer so that only positive exponents occur. Assume that all variables are positive.x1/8 ? x7/8
A. 
B. x7/8
C. x
D. x7/64
Mathematics
Find the quadrant that contains the terminal side of angle ?.sec ? < 0 and tan ? < 0
A. I B. II C. III D. IV
Mathematics