Sasha wrote each of the numbers 21 through 40 on a different index card. She will randomly pick one card. A is the event of picking a number that is divisible by 3. B is the event of picking a prime number.

Step-by-step explanation:

Given

-- Divisible by 3

--- Prime numbers

Required

This is calculated as:

Using probability formula, we have:

Where:

So:

-13

step-by-step explanation:

f(x)=2x-5 for f(-4)

f(-4)   means let x=-4

f(-4) = 2(-4) -5

f(-4) =-8-5

      = -13

i believe the answer is letter c) 8

step-by-step explanation: