Write the phrase as a mathematical expression. Use x to represent the number. Combine like terms if possible.7 times a number added to -6, added to 5 times the sum of 9 times the number 
A. 7(-6 + x) + 5(9x + 5); 52x - 37
B. 5(9x + 5) + [7x + (-6)]; 52x + 19
C. 7x - 6 + 5(9 + 5x); 32x + 52
D. 7(-6 + x) + 5(9 + 5x); 12x + 3
Answer: B
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Solve the problem.In a chemical reaction, the rate at which the amount of a reactant changes with time is proportional to the amount present, such that 
, when t is measured in hours. If there are 
of reactant present when t = 0, how many grams will be left after 
? Give your answer to the nearest tenth of a gram.
A. 3.7 g B. 0.1 g C. 11.2 g D. 7.5 g
Establish the identity.cot2 
= 
What will be an ideal response?
Factor the four-term polynomial by grouping.10x2 + 12xy - 15xy - 18y2
A. (10x - 3y)(x + 6y) B. (2x - 3y)(5x + 6y) C. (2x - 3)(5x + 6) D. (2x + 3y)(5x + 6y)
Graph the function and its inverse on the same Cartesian plane.f(x) = log1/9 x
A. 
B. 
C. 
D. 