If ƒ(x ) = 3x + 1 and and ƒ -1 = , then the ordered pair of ƒ(3) = (3, 10) (3, 2/3) (10, 3)

ƒ(x ) = 3x + 1

Switch x and y to find inverse

x = 3y + 1

3y = x - 1

y = 1/3 x - 1/3

ƒ -1 = 1/3 x - 1/3

ƒ(x ) = 3x + 1

ƒ(3) = 3(3) + 1 = 10

(3, 10)

answer: c.  

step-by-step explanation:

mixtures containing substances that get attracted to magnet can be separated using a magnet. we can separate iron from a mixture of sand and iron, as only iron attracts to the magnet.