exam Maths Puzzle Numerical Ability

can you please help me solve and check this problem: (((An investment of $1500 paid interest of $45 during a certain period. how much interest would an investment of $2000 invested at the same rate for the same length of time pay?)))

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exam Other Question

Graph the compound function below on the axes at right.
y=f(x)={3 , -1 <= x <=2}
3x+1, x > 2

all under same brackett what does this look like plotted out on a graph? I want to grasp the knowledge but need to see it in front of me as an example. Thank you for your help.

y = |x| + 3