Jon earns $15.50 per week for helping his dad deliver newspapers. He has helped his dad for 3 weeks. Jon uses part of his earnings to buy a new video game that costs $42.39 including tax. How much of his earnings does he have left?

Since Jon has worked for three weeks, we can multiply his weekly earnings by 3, because that’s the amount of weeks he’s earned money.

$15.50 x 3 = $46.50

From there, since Jon bought a video game, we know that he spent his money, meaning we’ll have to subtract the amount he paid for the video game from his total.

$46.50 - $42.39 = $4.11

Therefore, Jon has $4.11 left of his earnings.

Hope this helped! :)

(b) 240

step-by-step explanation:

first, we use the pythagorean formula using the given side lengths to find x. then we use x to find the side lengths. then we add the side lengths to find the perimeter.

pythagorean theorem formula:

a^2 + b^2 = c^2

(x - 20)^2 + (x - 40)^2 = x^2

x^2 - 40x + 400 + x^2 - 80x + 1600 = x^2

x^2 -120x + 2000 = 0

(x - 100)(x - 20) = 0

x - 100 = 0 or x - 20 = 0

x = 100 or x = 20

we see that the solution x = 20 must be discarded because it will give a negative side length and a side length of 0. the only valid solution is x = 100.

perimeter = sum of the lengths of the sides

perimeter = x + x - 20 + x - 40

perimeter = 3x - 60

replace x with 100.

perimeter = 3(100) - 60

perimeter = 300 - 60

perimeter = 240

d. you cannot tell because there are no values shown.