What expression is equivalent to 8x - 2y +x + x​

Find the balance at the end of 4 years if 1000 is deposited at the rate of

This is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 5 terms.

Compute the standard deviation of the following set of data to the nearest whole number. 10, 10, 15, 20, 25