exam Maths Puzzle Numerical Ability

Greg spent 1/4 hour (h) responding to emails and 5/8 h returning phone calls. How much time did he spend on the two activities?

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exam Other Question

Solve by completing the square :

-7x = 5 - x^2
instructions:

Graph in a coordinate plane
17. y<2x^2-4x+1


i have no idea how to simplify nor graph..