Two tonnes of gravel mix contains river stone and blue metal in the ratio 3:7. How many more kilograms of blue metal are there than river stone?

Evaluate 4 a for a = 5 2/3 . express your answer in simplest form.

The lengths of nails produced in a factory are normally distributed with a mean of 4.91 centimeters and a standard deviation of 0.05 centimeters. find the two lengths that separate the top 4% and the bottom 4%. these lengths could serve as limits used to identify which nails should be rejected. round your answer to the nearest hundredth, if necessary.

Solve each quadratic equation by factoring and using the zero product property. n^2 - 49 = 0