Question

Calculate using the order of operations

30 ÷ (-10) + (-20) ÷ (-1)


(-2)[(+10) - (+8)] + (-7)


(+6) + (+9) x (-5) ÷ (-3)


(4-7) x 2 + 12


(-3) + (-18) ÷ (+2) ÷ (-3)


3 x [14 + (-18)] - 8 ÷ (-4)


2. The daily low temperatures in Prince Rupert, BC, for five days in January were -4 C, +1,
+1C, and -6 C. What is the mean of these temperatures?
















3 The table shows changes in the number of subscribers to a community newsletter over a sixth month period.


Month
Change in the Number of Subscribers
1
+8
2
+6
3
-12
4
+5
5
-9
6
-10


What was the mean change per month in the number of subscribers?



There were 207 subscribers at the beginning of this period. How many were there at the end?



4. Over a ten-year period, the population of Saskatchewan decreased from 989 000 to 979 000. What was the mean population change per year?











5. The mean of five integers is -11. What is the sum of the integers?






6. The average temperature of the Earth’s surface is about 15 C. The temperature of the Earth’s crust increases by about 25 C for each kilometre below the surface. What is the average temperature 3 km below the Earth’s surface?



7. Ahmed had $100 in his savings account at the start of his summer job. For the next eight weeks, he added $70 to his savings each week. After he went back to school, he withdrew $55 per week from his savings. For how many weeks did he make withdrawals until his savings were gone?







8. A new freezer is at a room temperature of 22 C. When the freezer is turned on, the temperature inside drops by 4 C per hour. How long does it take the freezer to reach -10 C?







9. Shona earns $50 a week from babysitting. She spends $25, saves $15, and uses the rest to repay a loan of $100 from her sister.

After six weeks, how much has Rohana spent, how much has she saved, and how much does she still owe her sister?

How many more weeks will Rohana take to pay off the loan?

Answer 1

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