exam Maths Puzzle Numerical Ability

Graph the solution set:
x+2y>-4
2x-y>2

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exam Other Question

which is greater: the perimeter of a square with area 100a^2b^ in^2.
or the total perimeter of 2 squaress each with area 25a^2b^2 in^2?
why? This is the question:
5/7 of a group of students are boys.
There are 18 more boys than girls.
How many students are there altogether.

I am having trouble setting up this equa