Question

Related rates. A spotlight on the ground shines on a wall 12 m away. If a man 2 m tall walks from the spotlight toward the building at a speed of 1.3 m/s, at what rate is the length of his shadow on the building changing when he is 4 m from the building? (Round your answer to one decimal place.) I have no idea how to set this up. Please help.

Answer 1

need help?

Answer 2

yes please

Answer 3

@perl

Answer 4

Did you get a response?

Answer 5

not yet

Answer 6

This algebra right?

Answer 7

well related rates so calculus

Answer 8

have you tired drawing a triangle?

Answer 9

and marking the sides?

Answer 10

well yes but I don't know how that effects the shadow size on the well in relation to the mans speed

Answer 11

was a worksheet given to you?

Answer 12

no this is math homework online

Answer 13

ok.. no image?

Answer 14

you have to solve for M

Answer 15

show me how to set up the related rates equation

Answer 16

I drew my own image for it.

Answer 17

set the equation up 2m+1.3m=12m

Answer 18

2m+1.3=8 divide by 12m

Answer 19

do you know what related rates are?

Answer 20

@perl can u please help me