Given the function f(x)=-x^2+8x+9, state whether the vertex the represents a maximum or minimum point for the function

Should be a maximum as the negative in front of the first x signifies a negative (downward facing) parabola 

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.