4. Joseph's grandparents gave him $3,000 to invest for his high school graduation. He is considering two investment plans. Plan A will pay him 3.5% interest compounded annually. Plan B will pay him 3.6% compounded quarterly.

a. Write a function of Plan A and Plan B that calculates the value of each account after n years.

b. Algebraically determine, to the nearest tenth of a year, how long it would take for Plan A to triple Joseph's initial
investment

x = central angle apc = measure of minor arc ac

the two angles x and 30 add to 180, so x+30 = 180 and x = 180-30 = 150. the measure of minor arc ac is 150 degrees.

what we need to do from here is find the circumference and then multiply it by x/360 since there are 360 degrees in a circle. in this case, x = 150, so x/360 = 150/360 = 15/36 = 5/12. the shortest distance along the curve from a to c is 5/12 of the distance around the entire circle (aka circumference)

c = circumference

c = pi*d

c = pi*24

c = 24pi

now multiply this by 5/12 to get

distance along minor arc ac = (5/12)*(circumference)

distance along minor arc ac = (5/12)*(24pi)

distance along minor arc ac = 10pi

the formula you can use is

l = (x/360)*pi*d

with

l = length of minor arc

x = central angle

d = diameter

which essentially is the steps we took though a bit differently.

the answer is d. 75%

i can't see the picture : /