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Questions in Grade Middle-school

[Answered] Simplify: \[ 4c - 5c + 6c \]

[Answered] What is the main source of energy?

[Answered] Convert [tex]$\frac{69}{11}$[/tex] into a mixed number.

[Answered] The Nile begins as two separate rivers, the ___________ flowing from eastern Africa and the ___________ from central Africa.

[Answered] How many tens are in five hundred million?

[Answered] How did technology benefit Stone Age people? How could that technology have unexpected results?

[Answered] How did mesopotamia's geography help civilization to develop in the area

[Answered] Estimate the product by rounding: 9 times 54

[Answered] What is the answer to 49 divided by a number, such that the answer is not 7?

[Answered] What would happen to a cell if the cell membrane were solid and waterproof?