8. Only one of the following sentences about f(x) is true. Which one? f(x) a. f(

Question

8. Only one of the following sentences about f(x) is true. Which one? f(x) a. f(x) cannot be exponential or linear 9.2 12 5.6 2.0 1.6 c. f(x) is linear with intercept b, f is exponential with r·-40 d. none of the above 12.8 9. The following function shows exponential growth of money in an account after t years. What is the annual rate? 0 f(t) $850 $952 1066.24 $1194.19 a. 8% b. 10% c. 12% d. 14% 10. A lawn mower costs $1,200 but depreciates (goes down in value) $90 every year. What equa describes its worth after x years? a. W 1,200*90* b.w-1,200-90° c. 1,200 + (1-.90x d, w a 1,200-90x 11. If a painting is purchased for $1,000 and it happens to double in value every year, how much will it be worth 5 years from now? a. $5,000 b. $10,000 c. $16,000 d.$32,000 12. Which of these pairs of lines are parallel? a. 6x-3y-4 and 6y-3x-18 c, 6x-3y = 7 and 6y-3x = 9 b, 5x-2y = 9 and 11-6y-15x d. 5x+2y 13 and 12 6y-15x 13, A drug dissipates at a continuous rate 12% per hour. How long until a quarter of the drug is left. a.) 8.25 hours b. 14.75 hours c. 11.55 hours d. 12.95 hours 14. Which relative change is biggest? a. from 20 to 25 b. from 25 to 30 c. from 20 to 30 d. from 100 to 140 15, $1,000 placed into an account grows at 12% compounded annually. Placed into a different account it grows at 12% compounded quarterly. After 20 years, how much more money would you earn in the second account? a. 1,376.90b. 1722.10 C.99460 d. none of these

Explanation / Answer

10.

Let the number of years be x.

Depreciation in cost after x years = $90x

Worth of lawn mover after x years = 1200 - 90x

Option D is correct.

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