Solve systems substitution. y=4x-13 3x-3y=12

Which of the following expressions are equivalent ?

Find and simplify an expression for the area of five rows of x squares with side lengths of x centimeters.

In 2009, there were 1570 bears in a wildlife refuge. in 2010, the population had increased to approximately 1884 bears. if this trend continues and the bear population is increasing exponentially, how many bears will there be in 2018?