Y=10x-7
Y+7=10x-7+7
Y+7=10x
Y-Y+7=10x-Y
7=10x-Y
10x-y=7
Answer:
6
Step-by-step explanation:
Answer:
Step-by-step explanation:
x is the geometric mean because it is a part of both the small triangle on the left (with base 81) and the whole triangle (with base 225). Setting up the geometric means formula:
and cross multiply to get
so
x =
and
x = 135
Answer:

Step-by-step explanation:
Given

Required
Express as a standard polynomial
We have:

Rewrite as:

Open bracket

Add like terms
