Solve the problem.If the density of a substance is 6.95 × 10-5 tons per cubic foot, what would be the mass of 9.85 × 10-6 cubic feet of this substance. (Use the formula D = 
and round to the nearest hundredth, if necessary.)
A. 6.85 × 10-11 tons
B. 6.85 × 10-10 tons
C. 0.68 × 10-10 tons
D. 6.85 × 10-9 tons
Answer: B
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Solve.The value of a particular investment follows a pattern of exponential growth. In the year 2000, you invested money in a money market account. The value of your investment t years after 2000 is given by the exponential growth model 
By what percentage is the account increasing each year?
A. 6.8% B. 6.1% C. 6.5% D. 6.7%
Add or subtract as indicated. Express the answer as a single polynomial in standard form.(3x2 + 2x + 7) + (6x2 - 5x + 9)
A. 13x2 - 2x + 11 B. 9x2 - 3x - 16 C. 9x2 - 3x + 16 D. 9x2 + 3x + 16
Factor the GCF out of the given expression.x(x - 8) - 9(x - 8)
A. (x + 9)(x + 8) B. (x + 9)(x - 8) C. (x - 9)(x - 8) D. (x - 9)(x + 8)
Multiply the conjugates.(6
- 3
)(6
+ 3
)
A. 279 + 36
B. -3
C. 279
D. 81