You need to use the cosine for this and this is how you do it.
Use a percentage finder ;), also it will show you the work on some sites
;)
20 + 25(times the number of hours) = 282.50
You add the 20 because of the one time service fee.
Now lets work this out.
20 + 25x =282.50
25x = 262.50 (subtract both sides by 2 to get the x's alone)
x = 10.5 (divide both sides by 25 to get just x)
x = 10.5 hours
So the answer is A.
Answer- It's the last two, D & E
Step-by-step explanation:
