exam Maths Puzzle Numerical Ability

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.

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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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Cesium 13 is a radioactive element with a half life of 30 years. Predict how much of a 60mg sample of cesium137 would remain after 210 years. I am trying to figure out the formula to solve this Thanks