exam Maths Puzzle Numerical Ability

Two numbers have a sum of 39. Their difference is 11. What are the two numbers? Yes this is third grade math.

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exam Other Question

perform each matrix row operations and write new matrix:

|1 -1 5| -6|
|3 3 -1| 10| -3R(base1)+R(base2)
|1 3 2| 5|
54. If the inventor in exercise 53 charges $4 per unit, then her profit for producing and selling x units is given by the function P(x) = 2.25x - 7000.

(a) What is her profit if