Find an explicit formula for the arithmetic sequence 81,54, 2, 0... 1. a(n) = 27(n-1)
2. a(n) = 81 - (n + 27)
3. a(n) = 81 - 27(n)
4. a(n) = 81 - 27(n-1)

circle area = pi * radius^2

if diameter = 10 then radius = 5

circle area = pi * 5^2

circle area = pi * 25

circle area = 78.5398163397 square units

step-by-step explanation:

move it to the other side

step-by-step explanation:

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happy to

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