An alloy of copper is 10% copper and weighs 25 pounds. a second alloy is 18% copper. how much (to the nearest lb.) of the second alloy must be added to the first alloy to get a 13% mixture.

Given that de, df, and ef are midsegments of △abc, and de=3.2 feet, ef=4 feet, and df=2.4 feet, the perimeter of △abc is .

Before simplifying, how many terms are there in the expression 2x - 5y + 3 + x?

The cross-sectional areas of a right triangular prism and a right cylinder are congruent. the right triangular prism has a height of 6 units, and the right cylinder has a height of 6 units. which conclusion can be made from the given information? the volume of the triangular prism is half the volume of the cylinder. the volume of the triangular prism is twice the volume of the cylinder. the volume of the triangular prism is equal to the volume of the cylinder. the volume of the triangular prism is not equal to the volume of the cylinder.