The selling price of an item is $550. it is marked down by 20%, but this sale price is still marked up from the cost of $400. find the markup from cost to sale price.

Find the arc length of the semicircle. 7the grade

The volume of a spherical hot air balloon v(r) = 4 3 ? r3 changes as its radius changes. the radius is a function of time given by r(t) = 3t. find the instantaneous rate of change of the volume with respect to t at t = 2.

You are installing new tile on an outside patio. the area (in square feet) of the rectangular patio can be represented by 8x squared +33x+4.