A 4-ft vertical post casts a 20-in shadow at the same time a nearby cell phone tower casts a 120-ft shadow. How tall is the c

Question

4 years ago

11

ell phone tower?

1 answer:

Sedaia [141] · Answer 1 · 2022-01-09T10:44:16+03:00

change 20 in to ft

20/12 = 1 2/3 ft

4 ft x ft

------- = ---------------

5 /3 ft shadow 120 ft

using cross products

4 * 120 = 5/3 x

480 = 5/3 x

multiply each side by 3/5

480 * 3/5 = x

288 ft

A 4​-ft vertical post casts a 20​-in shadow at the same time a nearby cell phone tower casts a 120​-ft shadow. How tall is the c