Answer:
8 + .21 = 8.21
8 - .21 = 7.79
Step-by-step explanation:
You first multiply the outside exponents into the numbers in the parentheses.
When you have an exponent being multiplied directly to another exponent, you multiply the exponents together.
For example(because I am a bad explainer):


When you divide an exponent by an exponent, you subtract the exponents
For example:

When you have a negative exponent, you move it to the other side of the fraction to make the exponent positive
For example:



You can think of it like this if you want:
Now multiply the outside exponents into the exponents in the parentheses
Divide 27 and 9

Your answer is 
Solve for b, since we already have the slope
y = x + b
10 = 20 + b
b = -10
y = x - 10
Hope this helps!
Answer:
- 32/21 or - 1 11/21
Step-by-step explanation:
To divide by a fraction is to multiply by its recipricle.
3/7 × 2/1
simplify fraction
3/7 × 2
multiply
6/7