exam Maths Puzzle Numerical Ability

Describe what the graph of interval [-4, 10] looks like

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exam Other Question

Find the indicated function.
Let f={(-9,-2),(-8,-4),(-5,-1)} and g={(-9,1),(-7,-9),(-5,-2)}. Find f+g
The average of two numbers is 7. Find the numbers if three times one of the numbers is one half the other number.



I can not figure ths out. I can not get it written into two equations.