Page 114 - ArithBook5thEd ~ BCC

2
" # 3
15. −
5
1
" # 2
16. 2
2
1
" # 4
17. −
10
%
81
18.
4
%
121
19. −
144
%
25
20. −
36
%
−25
21.
36
−64
%
22.
−49
%
1
23. −
16
24. Find the average noon temperature for the first week of January in Barrow, Alaska if the noon
◦
temperatures were: Monday: −8 F, Tuesday: 2 F, Wednesday: −3 F, Thursday: −5 F, Friday:
◦
◦
◦
1 F, Saturday: 4 F, Sunday: 9 F.
◦
◦
◦
3.13 Combined operations
Now we put together everything we have learned so far. Recall that when there is more than one
operation to be performed in a calculation, we agree to follow the order of operations:

1. operations within grouping symbols first;

2. exponents and roots next;

3. multiplications and divisions (in order of appearance) next;

4. additions and subtractions (in order of appearance) last.

We remind you that “in order of appearance” means in order from left to right, and that “grouping sym-
bols” include parentheses, brackets, braces (curly brackets), the square root symbol, and the horizontal
fraction bar as in a+b .
c−d
3 1
Example 136. Calculate 2 − + .
5 2

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