Andrew was Making a science project. He worked 6.6 hours the first week, 2.75 hours the second week and 4.4 hours thethord week

Although answer is incomplete, I would assume that you would add the three numbers up.

Step-by-step explanation

Equation: 6.6 + 4.4 + 2.75 weeks

Step 1. Add either numbers. I decided to do this - 6.6 +4.4 = 11.0

Step 2. Add eleven to 2.75 - 11.0 + 2.75 = 13.75

Step 3. Finalize answer; 13.75 weeks

Check:  

I will subtract the 3 numbers in the same order I added them in.

Step 1. 13.75 - 2.75 = 11.0

Step 2. 11.0 - 6.6 = 4.4

Check is valid so the answer is correct.

Hope this helps.

the correct answer is 828.07