30 is the geometric mean between 9 and what number? show your calculations.

30 is the geometric mean between 9 and 51.

Step-by-step explanation:

i multiplied 30 by 2 because there are two numbers in the set of numbers that have a mean of 30.

30*2=60

i then subtracted 9, working back from finding the mean,

60-9=51.

check your work!

51+9=60/2=30

your answer is 51

1. is 4 and 2. is 3

step-by-step explanation:

so if you look at the first one you see that 1 is to 4 and 2 is to 8 and so on, so you can see for every 1 there is a times 4 so if it were 3 then it would be 3*4 and it is 12

for number 2 it is 3 because 1 is to 3 and 2 is to 6 so for every 1 there is 3 so if it were 3 then there would be 3*3 = 9

the first one, all those points on the line just make a strait line.