Find all 2-digit natural numbers that have exactly three factors.

The vertices of a triangle are a(7,5), b(4,2), c(9,2). what is m

Louis wants to carpet the rectangular floor of his basement.the basement has an area of 864 square feet.the width of the basement is 2/3 it's length. what is the length of louis's basement

How many kilograms of a 5% salt solution and how many kilograms of a 15% salt solution must be mixed together to make 45kg of an 8% salt solution?