exam Maths Puzzle Numerical Ability

*Tutor this is from my textbook Mccullough, pg. 332-334 Find the zeros of the polynomial function and state the multiplicity of each.f(x)=x (x+3)^4(2x+3)^2

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The cost of producing a number of items x is given by c=mx+b, in which b is the fixed cost and m is the variable cost ( the cost of producing one more item.
a)If the fixed cost is $40 and the variable cost is $10, write the cost equation.
The cost of producing a number of items x is given by
C = mx + b, in which b is the fixed cost and m is the variable cost (the cost of
producing one more item).
(a) If the fixed