Determine the area of the coin to the nearest tenth. When the height is 19 mm

Square a has a side length of (2x-7) and square b has a side length of (-4x+18). how much bigger is the perimeter of square b than square a?and show all work! you so

If it 8 inch candle burns at 7/10 inch per hour and a 6 inch candle burns at 1/5 inch per hour after how many hours would both candles be the same height

How many and of which kind of roots does the equation f(x)=2x^4−9x^3+17x^2−16x+6 have?