I have a problem with this question. It's in the Circles Unit. I don't understand the 5x + 15 part. Please help!

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

How are sas and sss used to show that two triangles are congruent?

Kyle and elijah are planning a road trip to california. their car travels 3/4 of a mile per min. if they did not stop driving, how many miles could kyle and elijah drove in a whole day? ? 1 day = 24 hours. plzzz write a proportion i will give you 100 points