The length of a rectangle is 4 ft longer than its width. if the perimeter of the rectangle is 48 ft , find its area.

Isee the amount was $90.00 then reduced to $75.00 , what is the percent ?

The class wants to raise a total of $750.if they receive a profit of $1.25 from each candybar sold, how many bars must they sell to reachtheir goal

If the speed of an electromagnetic wave is 100,000 cm/s and its wavelength is 100 cm, what is its frequency? a) 100,000 cycles per second (hz) b) 1 × 10-3 cycles per second (hz) c) 10,000,000 cycles per second (hz) d) 1,000 cycles per second (hz)