exam Maths Puzzle Numerical Ability

A group of 5 friends went to the movies. They found a row with 7 empty seats. In how many ways can the friends be seated in the row?

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exam Other Question

Express as a trigonometric function of one angle sin44cos22-cos44sin22.
(all Numbers are degrees)

a. cos22
b. cos66
c. sin22
d. sin66 Solve by completing the square.
4x^2 + 2x - 3 = 0