Suppose Ahmed and hit twin brother pool a portion of their summer earnings and invest $2000 in a four-year CD with a 2.8% APR compounded quarterly. Determine: a. the number of n of compounding periods per year. n= 
b. the number m of compounding periods for the CD. m= 
c. the interest rate for each compounding period(not the rate alone).   %
d. the value of the CD at maturity. F= 
e. the amount of the CD allocated to earned interest. D  
f. the APY. APY=  

Ahigh-altitude spherical weather balloon expands as it rises, due to the drop in atmospheric pressure. suppose that the radius r increases at the rate of 0.02 inches per second, and that r = 36 inches at time t = 0. determine the equation that models the volume v of the balloon at time t, and find the volume when t = 360 seconds. v(t) = 4π(0.02t)2; 651.44 in3 v(t) = 4π(36 + 0.02t)2; 1,694,397.14 in3 v(t) = four pi times the product of zero point zero two and t to the third power divided by three.; 4,690.37 in3 v(t) = four pi times the quantity of thirty six plus zero point zero two t to the third power divided by three.; 337,706.83 in3