exam Maths Puzzle Numerical Ability

Divide.

(30b^3 + 3b^2 + 42b + 30) / (6b+3)

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exam Other Question

A 100 KILOGRAM MIXTURE OF 0.69 KG. OF PINTO BEANS AND 0.89 KG. KIDNEY BEANS IS VALUED AT 81.00. HOW MANY KILOGRAMS OF EACH DOES IT CONTAIN?. If f(x)=x(x+1)(x-4), us ethe interval notation to give all values of x where f(x)>0?
Having trouble with this one, but my answer is (-1,4), is this right, thanks so much for check