exam Maths Puzzle Numerical Ability

Factoring Completely: How do you factor a problem like this: (x^2 + 10x + 21)

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exam Other Question

Two classes, one with 50 students and the other with 30, take the same exam. The combined average of both classes is 84.5. If the larger class averages 80, what is the average of the smaller class? Solve the following system of equations using the graphing method. Besure to state the solution to the system.
x-y=-5
2x-6y=-18