exam Maths Puzzle Numerical Ability

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?

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exam Other Question

v - 7 divided by -7 simplify 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