- In how many ways can you make 30 cents using quarters ,dimes and nickels ?

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Hey everyone! I need some help on a math problem. What is the exact value: Sin(Cos^-1(5/6)-tan^-1(1/3)).? How to solve ((cosxy)+(x/y))dx+1+((x/y)cos(x/y))dy=0 please help? 144.5 rounded to it's nearest tenth? Does anyone know the website that can find a pattern between any group of numbers? Ustomer account "numbers" for a certain company consist of 4 letters followed by 3 numbers.?