Factor the greatest common factor from the polynomial 3x^2 + 6x -9

Describe the possible echelon forms of the standard matrix for a linear transformation t where t: set of real numbers is onto.

Offering 30 if a plus b plus c equals 68 and ab plus bc plus ca equals 1121, where a, b, and c are all prime numbers, find the value of abc. the answer is 1978 but i need an explanation on how to get that.

An investment decreases in value by 30% in the first year and decreases by 40% in the second year. what is the percent decrease in percentage in the investment after two years