1) Which of the following is a step in evaluating a function? a) Interchange x and y. b) Replace all x's with the value given. c) Insert x into y. d) Make y the subject of the formula. 2) The function f(x) is defined by f:x→x 2 + 5. Do you agree that f(3)=14? a) Yes b) No 3) What is the value of g(-1), if g(x)=2x 2 ? a) 1 b) -2 c) 2 d) 0 4) h(x) is defined as h:x→3(x-1). What is the value of h(6)? a) 35 b) 17 c) 18 d) 15 5) Given that f(x)=3x 2 +2x-1, which of the following is equal to 0? a) f(0) b) f(-1) c) f(2) d) f(-2) 6) Amy evaluated h(-2) and got a value of -12. If h(x)=5x+2, is Amy's answer correct or wrong? a) Correct b) Wrong 7) h(x) = x 2 +1. What is the value of h (-8)? a) -15 b) -63 c) 65 d) 16 8) For which value of x is g(x)=26 and g:x→3(x-1)+2 ? a) 9 b) 25/3 c) 77 d) -5 9) Given that the distance travelled by a plane in kilometres, is related to the time taken in hours by the function, d(t)=80t, what is the time when the distance is 240 km? a) 3 hours b) 13 hours c) 6 hours d) 2 hours 10) For which value of x is f(x)=64 if f:x→x 3 ? a) 8 b) 4 c) 2 d) 16 11) Given that f(x)=3x-7 and g(x)=x+3, evaluate fg(4). a) 12 b) 8 c) 10 d) 14 12) Kyle has saved $700 and he earns $50 for each hour of landscaping that he does. If A-the amount of money Kyle has and h- the number of hours he works are related by the equation A=700+50h, how much money does he have after 6 hours of landscaping? a) $700 b) $300 c) $730 d) $1000 13) When a stone is dropped from the top of a cliff, the total distance fallen is given by the function D(t) = 4.9t 2. Find the total distance after the first 2 seconds of falling. a) 196 m b) 1.96 m c) 19.6 m d) 1960 m

Evaluating Functions

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