Please help this is a test grade and to me it’s so confusing

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

Campus rentals rents 2 and 3 bedrooms apartments for $700 ans $900 a month respectively. last month they had six vacant apartments and reported $4600 in lost rent. how many of each type of apartment were vacant?

For each sentence below, find the value of x that makes each sentence true. (515) 5 = 25* x= (813)2 = 4* x=