exam Maths Puzzle Numerical Ability

Problem Solving: How to solve:
Supppose you have 10 coins that total $0.85. Some coins are dimes and others are nickels. How many of each do you have????

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To whom may it concern,

I have encountered problem to do this question.

The angle of elevation of the top of a post from a point on level ground 38 m away its 33.23�. Find the height of the post.

Please help. Thanks a lot.

CH Lam how do i find the x- intercepts of -x^4+1.5x^3+8x^2-1.5x-7?