Answer: a) 6 b) 11.53 c) the smallest number of significant digits is 4
<u>Step-by-step explanation:</u>
a)
Complete the subtraction and addition (you can do this manually by lining up the decimal ... or... using a calculator)
2.784 - 3.00079 + 10.671 + 1.0798 = 11.5340
→ there are 6 digits in the answer
b & c)
2.784 has 4 significant digits
3.00079 has 6 significant digits
10.671 has 5 significant digits
1.0798 has 5 significant digits
→ the smallest number of significant digits is 4 so round the answer from part a to 4 significant digits: 