exam Maths Puzzle Numerical Ability

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%

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exam Other Question

How do I find the y-intercept for -x + 3y = 15? 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.