Question

Can someone explain me how to do this? No answers, just explanation how to solve. Click on the picture to see the question.​

Answer 1

Since you did not want the answer the things you need to solve this question are below.

Explanation:

In order to solve this, you will need to read about the scale factor. Here is a picture telling about it briefly.

Answer 2

800 cm

Explanation:

x = height of lamp post

set up a proportion:

90/160 = 450/x

cross-multiply:

90x = 72000

x = 800