John is 5ft tall and is standing in the light of a 15ft lamppost. His shadow is 4ft long. He walks 1ft father away from the lamppost, by how many feet will his shadow lengthen?

The shadow lengthened by 2.25 ft.

Step-by-step explanation:

Height of the lamppost is not needed here.

We can write the ratio as,

5 /4 = x/5

25 = 4x

x = 25/ 4

Now it is not needed to find the length of the new shadow, and so, we need to find the length of the added shadow.

25 / 4 - 16/ 4 = 25 - 16 / 4 = 9/4 = 2.25 ft

Length of the new shadow is 25/ 4 = 6.25 ft

So length of new shadow - length of old shadow = 6.25 - 4 = 2.25 ft shadow lengthened

the multiples of 15 are 15, 30,45, 60, 75, 90, 105, 120, 135, 150, 165, 180, 195,   210, 225, 240, 255, 270, 285, 300, 315, 330, 345, 360, 375,   390, 405, 420, 435, 450, 465, 480, 495, 510, 525, 540, 555, 570, 585, 600, 615, 630, 645, 660, 675, 690, 705, 720, and 735.

the factors of 15 are 1, 3, 5, and 15.

hope that , fam!

-une, your fren : )

i dont know

step-by-step explanation: