Instead of brainly you could just open your calculator.
10-3.585 = 6.415
Answer: 25cm
Es asi: 5cm x 5cm^2
Converting 1 hour and 15 minutes to minutes only, its 75 minutes. 75 - 54 is 21. So, Martin has 21 minutes left to finish.
Part A: W = 10x
Part B: S = 400 + 15y
Part C: 490 = 400 +15y
-400 -400
90 = 15y
6 = y, so he worked a total of 46 hours.
So I decided to make a visual aid for this problem.
All of the work is outlined in the image.
Your final answer is 109.
Hope that helps!