Answer:
The Common ratio should be 2.5
Step-by-step explanation:
as the formula goes, the first number in a sequence is multiplied by the common ratio, the amount of number space in between two numbers in a sequence, in this case 2.5 in order to get the next number. Hope this helps!
2.5h-15=4h
-2.5h -2.5h
-15=1.5h
————-
1.5 1.5
h=10