Julio says, If you subtract 18 from my number and multiply the difference by -5 , the result is-80 . What is s number?

34 is your answer

Step-by-step explanation:

34-18=16

16(-5)=-80

Step-by-step explanation:

Set up an equation using the given information:

"Multiply the difference" suggests that the subtraction should be done first. Following PEMDAS, in order to get subtraction done first, it would need to be in parentheses:

Then you would multiply that difference by -5:

Now set the expression as equal to -80:

Now you can solve for s. Use the distributive property:

Isolate the variable s. Subtract 90 from both sides:

Divide both sides by -5:

Your number is 34.

:Done

Check

Insert the value of s into the equation to determine if true:

This is true, so the value of s is correct.

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so:

f(x) = - 2/3x + 5; f(5/2)

substitute 5/2 in for x:

f(5/2) = -2/3(5/2) + 5

simplify the right side:

f(5/2) = -5/3 + 5

f(5/2) = 10/3

answer:

f(5/2) = 10/3

i hope this you!