exam Maths Puzzle Numerical Ability

what is the value of K for 2x+ky=5 if this
equation is perpendicular to 3x+y=-2?

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exam Other Question

Find the smallest angle in the triangle whose sides have length 35.6cm, 58.43cm,and 52.23. Given the formula P=-x/2 +75. Find the unit price
if seven items are sold.