Robert is 5 years older than his brother evan. together their ages add up to 67. how old is each brother?

36 AND 31

We know that they have to be at least 30 yrs old, and we know that robert is at least 35. If he is 36, Evan is 31. And they add up to be 67.

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(3x-8) or (3x+8)

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