Select the number line model that matches the expression -2 and 1.5 (khan academy)
1 answer:
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Solution: We know that:
Paul and Brett went to math class and were given the same expression to simplify. The expression they were given was 6 + 12 divided by 2(3) + 1.
Looking at the solution's by Paul and Brett, we clearly see that the Paul made a mistake at step 3.
6 + 12 ÷ 2(3) + 1
6 + 12 ÷ 6 + 1 Correct
18 ÷ 6 + 1 Incorrect It should have been 6 + 2 +1
According to order of operation's rule, division needs to done before addition.
Therefore, solution by Paul carries a mistake, while the solution by Brett is correct.
Answer:
3
Step-by-step explanation:
let n be the number, then
= 1 ← multiply both sides by 7 + n
10 = 7 + n ( subtract 7 from both sides )
3 = n