Ivan plans to recognize the music on his mp3 player . after the changes he is planning he will have 2 4/5 times as many hours of rock and hip hop music on his mp3 player ?

Alawn mower manufacturer incurs a total of 34,816 in overhead costs and 388 per lawn mower in production costs. how many lawn mowers were manufactured if the average cost of productions is 660

Could somebody me with this radical simplification?

Prove that 16^4-2^13-4^5 is divisible by 11.