The function f(n) = 100 * (0.25) ^ n represents the amount of a radioactive substance left after n hours. At what rate , in percent , is the amount of radioactive substance changing?

answer: can and shows the work

step-by-step explanation:

answer: cos [   arcsin (3/5) - arccos (1/2) ] =

step-by-step explanation: × = 3/5 = 0.6--> x = 36.87 and x = 180 - 36.87 = 143.13 deg

cos y = 1/2 --> y = +- 60 deg a. cos (x - y) = cos (143.13 - 60) = cos 83,13  

=

0.12

b. cos (36.87 - 60) = cos (-23.23) = 0.92

c-   36

taxicab circle radius 9 has 4(9) = 36 points