exam Maths Puzzle Numerical Ability

Can you please help me do this: Find the GCF of the three terms.
8b^4, 5c, 3a^2b

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exam Other Question

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. Here is a money problem that I need help with.

Suppose that the cost C, in dollars, of producing x items is given by C = 3 How many items can be produced for $ 13,000?

Thank you very much for your help.