Plus help need now thx

Acollection of nickels and quarters is worth $2.85. there are 3 more nickels than quarters. how many nickels and quarters are there?

Its due 1. what is the product of 1/2-1/4? write your answer in standard form. a) show your work. b) is the product of 1/2x-1/4 and 5x^2-2x+6 equal to product of 1/4x-1/2 and 5x^2-2x+6? explain your answer.

Acar travels 85 kilometers per hour. what is the equivalent speed in meters per hour?