What is the cube root of -729a^9 b^6?

Arianna is buying plants for her garden. she buys 15 flowering plants for $96. pink flowering plants sell for $8, and purple flowering plants sell for $5. how many pink flowering plants did arianna buy? i figured out the answer! the answer is 7. 8x +5y = 96 plug in 7 for x 8 (7) + 5y = 96 56 + 5y = 96 subtract 56 from both sides 5y/y = 40/5 y = 8 she bought 7 pink and 8 purple plants

Sam claims that cos x =sin y if x and y are congruent angels. is sam correct ?

The perimeter of a stage is 116 feet. it is 17 feet wide. how long is it?