Answer:
1.75
Step-by-step explanation:
If a and b are two numbers, then their arithmetic mean is

Given:

Divide this equation by 10:

Now, divide it by 2:

Answer:
20y^7. this is because the exponents are added together because the variable attached to the coefficient are the same therefor the coefficients are multiplied, and the exponents are added together.
Answer:
r= 9
Step-by-step explanation:
radius (r) = diameter (D)/2
= 18/2
= 9
Answer:
the answer is x= 3 and y= -1