Simplify the rational expression state any excluded values

Simplify the expression. -2/5(10+15m-20n)

Which is the correct first step in finding the area of the base of a cylinder with a volume of 26x cubic meters and a height of 6.5 meters? v=bh 6.5=b(26x) v=bh v=26pi+(6.5) v=bh v=26pi(6.5) v=bh 26pi=b(6.5)

You buy 4 items that cost 2.69 14.45 8.05 13.95 what is the estimated total round to the nearest dollar