exam Maths Puzzle Numerical Ability

how do you graph and list several solutions with this problem?

y>=x+3

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exam Other Question

How many gallons of a 12% solution must be mixed with a 32% solution to obtain 180 gals. of 22% solution?

Im not sure how to get this
Determine whether the function f(x) = -x^2-2x-7 has a maximum or minimum value and find the coordinates of the point.