Use the rules for exponents to rewrite the expression and then evaluate the new expression. 
A. 0
B. -12
C. 1
D. -4
Answer: C
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Use the pH scale to answer the question.If the pH of a solution increases by 4, how much does the hydrogen ion concentration change? Does the change make the solution more acidic or more basic?
A. Decreases by a factor of 10,000; more basic B. Increases by a factor of 40; more acidic C. Increases by a factor of 10,000; more acidic D. Decreases by a factor of 40; more basic
Solve the system by the addition method, if possible. If a solution exists, give the value of x.
?
?
A. -1 B. ?4 C. ?2 D. ?-2 E. no solution
Write the number in scientific notation.0.0000020717
A. 2.0717 × 10-7 B. 2.0717 × 10-6 C. 2.0717 × 10-5 D. 2.0717 × 106
Solve the problem.Of 194 trees in the park, 43 are coniferous trees. What fraction of the trees are not coniferous trees?
A. 
B. 
C. 
D. 