How much will it cost to travel 8.7 miles?

Which equation and solution can be used to solve this problem? thirteen less than a number is sixteen. 13-n=16: add 13 to both sides. the answer is 29. n+13=16: subtract 13 from both sides. the answer is 3. n+16=13 subtract 13 from both sides. the answer is 3. n-13=16: add 13 to both sides. the answer is 29.

What is the value of r of the geometric series?

Simplify. (-2)^-3 a. -8 b. -1/8 c. 1/8 d. 8