book Maths Puzzle Numerical Ability

Calculate the least velocity of projection required to give a missile a horizontal displacement of 500 m if the angle of projection is 24 degrees.

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book Other Question

For the Arithmetic sequence 3x + 5y , 4x + 2y, 5x- y, 6x - 4y.....
a.Find d _________ b. Find the 40th term _____________________ what is the exact value of sin 22.5 degrees using the sum, difference, half, or double angle formulas and the exact value chart in the solution.