exam Maths Puzzle Numerical Ability

A total of $3.45 constisting of dimes and quarters was collected from a soft drink vending machine. If there are 3 more dimes than quarters, find the numnber of dimes and quarters.

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exam Other Question

Used the symbol @ for the regular symbol.

Given that cos@ = - 4/5 and @ is in Quadrant 2, find:

sin @=
sin 2 @=
cos 3 @=
tan @ / 2=
sin (@ + 60 degrees)= Mixed Operations???
I am lost and do not know where or how to begin this page.