exam Maths Puzzle Numerical Ability

What should be the diameter (d) of a pizza so that it has the same areas as two 10-in.-diameter pizzas? Do you get more to eat with a 15-in. pizza or two 10-in. pizzas?

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exam Other Question

Find the standard form of the equation of the line with slope -2 and y-intercept -4.

Choices are:

8x+4y=-16

y=-2x+4

-8x-16y=4

4x+8y=-16 How do you solve (x+b)(x-b)=x(x-5) for x? I would like to see every step and it would be nice if you could explain why you did each step. Thank you very much.