The first question answer is 21*10^7
The second question answer is 5*10^2
Answer:
Mistake: -3-5=-2, -3-5=-8
Step-by-step explanation:
-3-(7x+5)+9x=-8+3x+10
-3-7x-5+9x=4x+2
-8+2x=4x+2
-8-2=4x-2x
-10=2x
-10/2=x
-5=x
= 12a^3b + 240a^2b^2 -48ab
First distribute
a(b+c)=ab+ac so
2(x+3)=2x+6
-3(2-2x)=-6+6x
5x+3=2x+6-6+6x
add like terms
5x+3=2x+6x+6-6
5x+3=8x+0
subtract 5x from both sides
3=3x
divide both sides by 3
1=x
there are 1 solutions
The circumference of a circle can be calculated using the following formula:

Where "C" is the circumference of the circle and "d" is the diameter of the circle.
According to the information given in the exercise, the diameter of this circle is:

Knowing the diameter, you only need to substitute it into the equation. Remember that you need to use

Then:

The answer is: