exam Maths Puzzle Numerical Ability

how do i solve the following equation for values of x in the range
0 degrees < x <360 degrees

6sin^2 x - sinx - 2 = 0

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exam Other Question

Mary has 84 coins that have a total value of 5.55$. if all the coins are nickels and dimes. How many of each does mary have? Please help me, this question I need to simplify, the problem is:
n^-2
-
n^3
Please and Thank you=)