The total surface area A of a cylinder with a fixed volume of 1000cm³ is given by the formula A=2πx²+2000/x where x cm is the radius. Show that when the rate of change of the area with respect to the radius is zero, x³=500/π

If your annual gross income is $62,000 and you have one monthly car payment of $335 and a monthly student loan payment of $225, what is the maximum house payment you can afford. consider a standard 28% front-end ratio and a 36% back-end ratio. also, to complete your calculation, the annual property tax will be $3,600 and the annual homeowner's premium will be $360.

You have a square piece of cardboard that measures 14 inches on each side. to build a box, you cut congruent squares out of each corner of the cardboard. use the picture to find the area of the cardboard you were used to build the box

Could someone me with this question i’ve been stuck on it for 20 minutes