How many square roots exist for the number 9?

What is the slope of the line that contains the points (4,8) and (9,8)? what type of line is it?

Achemist has 200 ml of a 10% sucrose solution. she adds x ml of a 40% sucrose solution. the percent concentration, y, of the final mixture is given by the rational function: the chemist needs the concentration of the final mixture to be 30%. how many milliliters of the 40% solution should she add to the 10% solution to get this concentration?

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