exam Maths Puzzle Numerical Ability

Can someone correct these for me when theres a little chance thanks...

Problem #1
Find the simple interest. Assume a 360-day year. Round result.

$17000 at 9% for 119days

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exam Other Question
A line goes through the coordinate (3,4) and through (5,1). Find a line of the form y=ax+b. 3 laps is 5/8 of a mile. If he runs 3 miles, how many laps does he need to run?