A rectangular paddock has perimeter 100 m. Find the width of the paddock if its length is 30 m.

Witch represents the inverse of the function f(x)=1/4x-12

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25

Rose and andrew are financing $128,000 to purchase a condominium. they obtained a 15-year, fixed-rate loan with a rate of 5.05%. they have been given the option of purchasing up to four points to lower their rate to 4.81%. how much will the four points cost them?