Question

If ƒ = {(2, 5), (3, 2) (4, 6), (5, 1), (7, 2)}, then ƒ is a function.

True
False

Answer 1

HI!!

Answer 2

the first numbers are all different so TRUE

Answer 3

If ƒ (x ) = 4x - 3, what is ƒ (x )^-1?

Answer 4

\[4y-3=x\\
4y=x+2\\
y=\frac{x+3}{4}\\
f^{-1}=\frac{x+3}{4}\]

Answer 5

If ƒ (x ) = 2x^2 + 3, find ƒ (3).

31
15
21
39

Answer 6

\[f(3)=2\times 3^2+3\] and a calculator or \(18+3=21\)

Answer 7

If ƒ = {(2, 3), (5, 7), (3, 3), (5, 4), (9, 1)}, what is the range?

{2, 5, 3, 9}
{3, 7, 3, 4, 1}
all whole numbers
{1, 3, 4, 7}

Answer 8

the list of the second numbers \[\{1,3,4,7\}\]