Chang added some chlorine to the water in a pool. The chlorine evaporate in at a fixed rate every week. The table below shows the amount of chlorine f(n), In ounces, that was left in the pool after 10 weeks n |f(n)
1 | 24
2 | 12
3 | 6
4 | 3

Which function best shows the relationship between n and f(n)?

^ = To the power of

•f(n)=48(0.5)^n-1
•f(n)=24(0.5)^n
•f(n)=24(0.5)^n-1
•f(n)=48(0.5)^n+1

This is high school algebra by the way

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 ) y = 2.5 x - 26.25

in counting the number of heads in 4 coin flips, the probability that we get exactly one head is the probability that we get anyone of the following 4 outcomes: httt, thtt, ttht, or ttth. each has probability 1/16, so the probability to get exactly one head in 4 flips is 1/16 + 1/16 + 1/16 + 1/16 = 4/16 = 1/4.