exam Maths Puzzle Numerical Ability

Graph on a plane.
y > -1

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exam Other Question

Rudy must play 12 commercials his 1-hr radio show Each commercial is either 30 sec or 60 sec long. If the total commercial time during that 1-hr is 10 min how many commercials of each type does Rudy play? what is the square root of x^2-2x+1?