exam Maths Puzzle Numerical Ability

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.

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walt made an extra $9000.00 last year from a part time job. he invested part of the money at 10% and the rest at 7%. he made a total of $780.00 in interest. how much was invested at 7% *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