Help? ill give u brainilest and some of my chips! <3 (look at my pfp and you'll get it)

Find an equation for the linear function which has slope -10 and x-intercept -7

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!

Witch sequence shows a pattern where each term is 1.5 times the previous term