Answer:
205
Step-by-step explanation:
Were gonna start by writing an equation (121+184+x)/3=170 because were adding a 3rd value to the average and x is going to be our value that were looking for. If you solve that, you get 205. Hope this helps.
#7
2,4,8,16
15,30,60,120
#9
1,2,3,
4,8,12
15%=3
5%=1
5(20)=100
1(20)=20
So, there are 20 students in the class.
It's called a rectangle. This is just a definition, so there is not much to explain.
