A box with a closed top has a base length that is three times its width. It needs to be hold 500cm 3 of material. Find the dimensions of the box that will have the smallest
surface area.

Solve the equation using the given values: x= -2.5; y= -7.51. 2xy + 2x²

Having a hard time understanding this question (see attachment).

Look at the figure below: triangle abc is a right triangle with angle abc equal to 90 degrees. the length of ac is 5 units and the length of ab is 4 units. d is a point above c. triangle adc is a right triangle with angle dac equal to 90 degrees and dc parallel to ab. what is the length, in units, of segment cd?