PLEASE HURRY ON A TEST!!

Given similar figures, find the length of the missing side.

What adds to be the bottom number but also multiplies to be the top number with 8 on the bottom and 15 on top

The first week samantha learned to read braille, she could read 10 words per minute. in the second week she increased her speed by 20%. in the third week she increased her speed again by another 25%. how many words could she read per minute by the third week? hurry and tell me!

Asail is in the form of a right triangle that is 3 times as high as it is wide. the sail is made from 6 square meters of material. what is the height?