Answer:
3.1 × 
Step-by-step explanation:
given
6.6 ×
- 3.5 × 
Take out
as a common factor from both terms
=
(6.6 - 3.5)
= 3.1 × 
Answer:
85/100 = x/20
100x = 1700
x = 17 questions she answered correctly
x + 17 = 20
x = 3 questions she answered incorrectly
Step-by-step explanation:
Should be simple:
Let's take this one at a time.
2x(x-3y)
You'd get:

for the first one.
2nd one:
5y(x-3y)
you'd get:

Put them both together:

Combine like terms.
Your Answer:
Answer: 
Step-by-step explanation:
The given expression: 
Here, 

That is

Answer:
1131.0 m^3
Step-by-step explanation:
Let h1 represent the height of the top cone, and h2 the height of the bottom cone. The volume of a cone is given by the formula ...
V = (1/3)πr^2·h
so the volumes of both cones together will be ...
V = (1/3)πr^2·h1 + (1/3)πr^2·h2 = (1/3)πr^2·(h1 +h2)
= (1/3)π(6 m)^2(12 m + 18 m) = 360π m^3
≈ 1131.0 m^3