exam Maths Puzzle Numerical Ability

i NEED HELP IN THESE PROBLEMS DEALING WITH MONEY CAN SOMEONE HELP ME PLEASE.

Problem #1

I have to find the simple interest. Assuming a 360-day year. Round result.

$17,00

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exam Other Question
(-3-5)sqrt2+(-4-2)sqrt2 this is supposed to add up to sqrt100 and then into 10 how is this problem done? Solve each of the following systems by substitution
8x - 4y =16
y = 2x - 4