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\(20 = 15cos({π \over 30}(x - 30)) +18\)

 

The answers are 16.3 and 43.7. How can I get those numbers?

 Apr 23, 2020
 #1
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Make sure your calculator is in 'radian' mode:

 

2= 15 cos(pi/30(x-30))

2/15 = cos (pi/30(x-30))

arcos 2/15 = 1.437   =  pi/30(x-30)        Now can you solve for 'x' ?

 

 

 

 

You didn't give a range over which to find x      arcos 2/15  also =  -1.437

    so   -1.437 = pi/30 (x-30)       Solve for  'x'

 Apr 23, 2020

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