Raina bought 15 pounds of sugar for 7 how many dollars did she pay per pound of sugar

Find all the values of x that make 0.1x + 0.25(102 - x) < 17.10 true.

The base of a triangle exceeds the height by 7 centimeters. if the area is 400 square centimeters, find the length of the base and the height of the triangle.

Complex numbers multiply √-4 * √-25 and show all intermediate steps. alternative notation is sqrt(-4) * sqrt(-25).