book Maths Puzzle Numerical Ability

I really hope someone can help me out on this. I cant figure it out. Thanks.
A company specializing in magazine sales over the telephone found that in 2500 phone calls, 360 result

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book Other Question

Find all real and imaginary solutions to each equation.
b^4 + 13b^2 + 36 = 0
i have to find the slope intercept form of the equation of the line passing throught points(-1,-2)and (-4,-3) i got the answer 1/3 now i have to plug it in and solve which formula