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12.Sarah has 4 books in her bag. Each bag weighs 5000 grams. What is the total weight of books in kilograms?

A. 20 kg
B. 200 kg
C. 0.2 kg
D. 2 kg

13.What is the English phrase of x+2?

A. A number raised to the power of two
B. Twice a number
C. A number increased by two
D. The quotient of a number and two

14.If x stands for a real number, what is the mathematical sentence that represents thrice a number divided by five is four?

A.3x = 5 + 4
B. 3 = x ÷ 54
C. 5/3x = 4
D. 3x ÷ 5 = 4