Write the expression with only positive exponents and evaluate if possible. Assume all variables represent nonzero real numbers.
A. 2y + 
x - 4
B. 2y - 
x + 4
C. 2y + 
x + 4
D. 2y - 
x - 4
Answer: A
Mathematics
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Solve the problem.The cost, in millions of dollars, for a company to manufacture x thousand automobiles is given by the function 
Find the number of automobiles that must be produced to minimize cost.
A. 45 thousand automobiles B. 3 thousand automobiles C. 9 thousand automobiles D. 6 thousand automobiles
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Find the exact value of y, or state that y is undefined.y = tan-1 
A. - 
B. 
C. - 
D. 
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Multiply. Simplify by combining like terms.(m2 + 0.4n)(m2 - 0.4n)
A. m4 - 0.16m - 0.16n2 B. m4 - 0.16n2 C. 2m4- 0.8n2 D. m4 + 0.16n2
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Find the slope and the y-intercept of the given line.y = -4x + 7
A. -4, (0, -7) B. 7, (0, -4) C. -7, (0, -4) D. -4, (0, 7)
Mathematics