I have a very hard question if I get it right it brings up my grades. Please help me it's timed.

How many different ways can you make change for $.50 using only nickels,dimes, and quarters?

Find the solution set of this inequality. enter your answer in interval notation using grouping symbols. |8x-4| ≤ 12

Rena is building a 1: 180 scale model of a real castle. her model has a rectangular base that is 3 feet wide and 4 feet long what is the area of the base of the actual castle in square feet