Question

Please check my answers?
1.What is the domain of the function: {(1, 2); (2, 4); (3, 6); (4, 8)}?
Ans: {1,2,3,4}
2. What is the range of the function: {(1, 3); (3, 5); (5, 7); (7, 9)}?
Ans: {3,5,7,9}
3. If f(x) varies directly with x and f(x) = 3 when x = 12, then what is the value of f(x) when x = 40?
Ans: 160
4. Given the function T(z) = z – 8, find T(–2).
Ans: -10
5. What is the turning point of the graph of f(x) = |2x| – 3 ?
Ans: couldn't decide between 0,0 or 0, -3

Answer 1

#3 is incorrect

Answer 2

for #5, I recommend you graph it using something like desmos

http://www.desmos.com/calculator

Answer 3

the others are correct

Answer 4

Thank you @jim_thompson5910 , I'll work on those two!

Answer 5

yw

Answer 6

is #5 2,0? @jim_thompson5910

Answer 7

no

Answer 8

look at where the graph has the lowest most point (ie at the pointed end)