book Maths Puzzle Numerical Ability

Please help solve this equation. I am a parent trying to understand what I need to explain. 5-1/2(x-6)=4.

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How would I solve this?:

The Great Pyramid of Cheops has a square base of 756 ft on a side and a height of 481 ft. How many apartments 35 ft x 20 ft x 8 ft would be needed to have a volume equivalent to that of the Great Pyramids?

Thanks! Hi Tutors:
I am studying "Functions and Graphs." Can you please show me step by step how to find the domain? PROBLEM: f(x)=7/5-x (5-x is the denominator). Thanks in advance.