The inverse of a cubic function is also a function. a. always true b. sometimes true c. never true a linear function has an inverse relation. a. always true b. sometimes true c. never true

b. sometimes true

If the derivative of the cubic has two real zeros, the inverse relation will not pass the verical line test.

_____

The attached graph shows two inverse cubic relations, one a function, one not.

3

step-by-step explanation:

in standard form:

a= dictionaries

b= maps

you have to buy 3 dictionaries, so put a 3 next to the a (dictionaries) so that you can multiply them by each other.

a3+b= 60 (the amount of money you have)

we already know the cost of a=15 so replace a with $15

($15 x 3)+b=60

multiply 15 and 3 to get $45 and replace it with $45

45+b=60

and then replace b with 15 to get the total:

45+15=60

that means you have $15 left after buying 3 dictionaries.

15 divided by the cost of a map ($5) equals 3.

so you can buy 3 maps.

sorry if it was confusing!