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How do you solve the system of equations: #2x + 6y + 3z = 5,  2x + 2y + z = 15 , and  3y + 4z = 9#?

How do you evaluate #\frac { 1} { 3} z  \frac { 1} { 3} = 1#?

How do you simplify #sqrt35divsqrt7#?

The mean of the numbers 8, 12, 13, 15, 17, 19 and y is 16. what is y?

A student has gotten the following grades on his tests. What is the minimum grade he must get on the last test in order to have an average of 84?