9). A rectangular swimming pool has a length of x yards and a width 10 yards more than its length. How much does it cost to border the outside of the pool using 1-yard tiles that cost $4 each?

i believe the answer is c.

the answer is b

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

answer: c. im 100 percent sure

step-by-step explanation: