exam Maths Puzzle Numerical Ability

Quadrilateral ABCD is in the shape of a kite. AB and AD are both 2 feet. BC and BC are both 3 feet. There is a line from A to C and another line from B to D. AC is 4 feet. What is the measure of the angle the 2-foot edge makes with the 3-foot edge?

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exam Other Question
The present value P that will amount to A dollars in N years with interests compounded annually at an interest rate R is given by
Find the present value that will amount to 50,000 in 20 years at 8% compounded annually
 solve by substitution 5x-2y=-5
y-5x=3