Forty liters of a 60% disinfectant solution are to be mixed with a 10% solution to dilute it to a 20% solution. How much of the 10% solution must be used?

A gemstone is cut in the shape of a triangular pyramid. The area of the base of the pyramid is 42 square millimeters. the height of the pyramid is 4 millimeters. what is the volume of the gemstone.

Express as a trinomial: (2x-3) (x + 5)

Find the x-intercept of the rational function. A rational function is graphed in the second quadrant, and in the first, third and fourth quadrants are other pieces of the graph. The graph crosses the x axis at 6 and crosses the y axis at negative 2.

Eric has 112 books. each shelf holds 10 books. how many shelves can Eric fill completely?

What is the constant of porportionality of y=4/7x

Emma seys that the preduct of a 3-digit number and a 1-digit number will be either a 3 digit number or a 4 digit number. Does Emma's statement make sense

Work out the value of these two questions: 1) 3^2 + 2^3 2) 2^4 - 3^2

What is 5 1/4 divided 2 2/7

What is the solution to the system of equations? Use the substitution method. {y=-2x+5 {3x-4y=2 Enter your answer in the boxes.

Absolute value of - 1 + 3i