exam Maths Puzzle Numerical Ability

Stan invested $5,000, part at 8% and part at 17%. If the total interest at the end of the year is $490, how much did he invest at 8%?

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exam Other Question

You have two vertical angles. One measures (4x+2) degrees. The other measures (5x-13) degrees. What is the measure of each angle? Find the slope of the graphed line.
The graphed line is a vertical line at the 3 points across the graph. I would appreciate your help with this. Thanks.