Kim read b books last month. This month she read 18 books. Which expression shows the total number of books Kim has read in the past two months?

A.

b - 18

B.

b + 18

C.

b * 18

D.

b : 18

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At 12 o'clock the temperature was 7°C. The temperature decreased by - 20°C. What is the new temperature?

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