exam Maths Puzzle Numerical Ability

Are lines L1 through points (-3,2) and (0,4) and L2 through points (2,3) and (5,1) perpendicular?

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exam Other Question

Partners in a business agreed to take out 2 loans totaling $35000. The yearly interest rates were 12% and 15% and the total yearly interest was $4650. Find the amount of each loan. During the first 4 hours of a trip, you average 40MPH. How long must you travel at 60MPH to finish with an overall average speed of 55MPH?