exam Maths Puzzle Numerical Ability

Can you help me solve: The speed of an object falling from rest in a vacuum in directly proportional to the time it has fallen. After an object has fallen for 1.5 s, its speed is

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add. x/12 + 3x/12
I came up with 4x^2 - just want to make sure I am doing the steps correctly There are 850 Douglas Fir and Ponderosa pine trees in a section of forest. The company paid an average of $300 for each Douglas fir and $225 for each Ponderosa pine. If the company paid $217,500 for the trees, how many of each kind did the company buy?