A metalworker has a metal alloy that is 20 % copper and another alloy that is 65 % copper. How many kilograms of each alloy should the metalworker combine to create 120 kg of a 47 % copper alloy?

Trevor earns $7.80 an hour take home pay and works 20 hours each week. Trevor wants to buy a new laptop computer to take to college that costs $780. How many weeks will it take for Trevor to achieve his goal?

Pat is 12 years old James is 3 times as old as pat Raymond is 9 years younger than James. How old is raymond

125m on the ground corresponds to 2.5 cm on a map. What is the actual distance between two objects if they are 4.2 cm apart on the map?

Solve the system of equations using elimination. 2x + y = 9 8x - 2y = 6

salma and ahlam are making cat toys from yarn. salma need 1/2 yard for the toy she is making. ahlam needs 3 times as much yarn as salma. how much yarndose ahlam need

Calculate the area of a 10 inch circle. Round your answer to the nearest hundredth.

Use Lagrange multipliers to prove that the rectangle with maximum area that has a given perimeter p is a square. Let the sides of the rectangle be x and y and let f and g represent the area (A) and perimeter (p), respectively. Find the following.

Solve the inequality 9 (x - 3) < 4 (x + 10). x < 13/5 x > 13/5 x < 67/5 x > 67/5

Order these numbers from least to greatest. 8420, - 0.45, 17, - 818

How to graph 6x+3y=-12