Consider the expression - 6 3/5 -(-7 4/15) +2 1/5

a. Estimate the value of the expression. Show your work.

b. Find the exact value of the expression. Show

your work.

C use your estimate to explain if your answer to problem 4b is reasonable

a) 7x=7

step-by-step explanation:

no

step-by-step explanation:

answer

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