The sum of three numbers is 79 . the third number is 2 times the second. the first number is 5 less than the second. what are the numbers?

first = 21 - 5 = 16

second  = 21

Third = 21*2 = 42

Step-by-step explanation:

first + second + third = 79

Let the second number = x

third = 2*x

first = x - 5

So we get

x - 5 + x + 2x = 79

4x - 5 = 79                  Add 5

4x - 5 + 5 = 79 + 5     Combine

4x= 84                         Divide by 4

4x/4 = 84/4

x = 21

g

step-by-step explanation:

f(x) = y

f(-3) = -5

step-by-step explanation: