Question

1. Refer to Expression 1 and Expression 2.

Expression 1
5+4(2)+6-2-2-1
Expression 2
5+4(2)+6-2-2-1

(a) What is the value of Expression 1?
(b) Insert parentheses in Expression 2 so that it has a value of 20. Then show why your expression has a value of 20.

Answer 1

1. 14.

2. . 5+4(2+6)-2-2-1

5 + 8+12 -2-2-1

5+20-2-2-1

25-2-2-1

25-5

20

Explanation:

5+4(2)+6-2-2-1

First multiplication

5+8+6-2-2-1

Left to right

13+6-2-2-1

19-2-2-1

17-2-1

15-1

14

5+4(2+6)-2-2-1

5 + 8+12 -2-2-1

5+20-2-2-1

25-2-2-1

25-5

20