Find the value of x, if the mean of 17, 22, 18, 21 and x is 20

Step-by-step explanation:

This may be confusing but bear with me

20=(x+17+22+18+21)/5 is our equation because

20 is our mean and we are adding all of our values and diving by how many values we have. we have 5 values

we multiply 5 by 20 to cancel the dividing 5 on the right so

100=x+17+22+18+21

To make this simpler we can add all of the values (except x) so

100=x+78

lets subtract 78 from 100

22=x or x=22

I hope this helped

hello :

70y^8 + 30y^6 = 2 ( 35 y^8 + 15y^6)

the lenght is : 35 y^8

the width is : 15y^6

111

step-by-step explanation: