exam Maths Puzzle Numerical Ability

For x>0, what is 7x divided into 2 then divide by 1 divided into 4x

a. 3.5x
b. 14x
c. 28x
d. 14x^2
e. 28x ^2

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exam Other Question

A rectangular solid has a base with length 6 cm and width 5 cm. If the volume of the solid is 300 cm3, find the height of the solid. "Explain in your own words(at least 50 words) why the line x = 4 is a
vertical line?"

I think i know the answer i just have a hard time explaining this can you help me?