Write the expression with only positive exponents and evaluate if possible. Assume all variables represent nonzero real numbers.
(-8y)
A. -9y
B. -10y
C. 20y
D. 10y
Answer: B
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Solve the problem.A controlled placebo experiment is said to be blind when
A. the members of the treatment group are told they are in the control group. B. neither the members of the control group nor the members of the treatment group know to which of the two groups they belong. C. none of the scientists conducting the study know which patients are in the control group and which patients are in the treatment group. D. the members of the control group are told they are in the treatment group. E. none of these
Perform the following operation and write the result in lowest terms. - 9
+ 1
A. 7
B. -8
C. 7
D. - 7
Perform the indicated operation and express in lowest terms.
+ 
- 
A. 
B. 
C. 
D. 
Simplify by removing parentheses and collecting like terms.8x - (2x - 14)
A. 6x + 14 B. 6x - 14 C. -6x - 14 D. -6x + 14