13x - 21x - 7 = 63
- 8x = 70
x = - 8.75
Answer:
Step-by-step explanation:
When dividing by the same base (r) subtract exponents.
A property of the roots say:
Therefore;
Answer:
400/π
Step-by-step explanation:
Well, we know that the formula for circumference is πd. (d is the diameter) Then, we set up the equation 'πd = 400'. Now, simplifying for d, we get d = 200/π.
Answer:
78
Step-by-step explanation: