exam Maths Puzzle Numerical Ability

Under what condition(s) would using the quadratic formula not be the easiest way to solve a quadratic equation?

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exam Other Question

the measure of <1 and relationships of <1 to <2 is given. Find m<2.

m<1=47 degree, complementary to <2.
Could I get your assistance in solving the three function problems below:

1)y = sqrt x-1
1b) is this a function or not?

2)y = 2x-3