Translate the sentence into an equation.
The sum of 5 times a number and 9 is equal to 4.

Grandpa ernie is shrinking! over the past 4 years his height decreased by a total of 2.4 cm.it decreased by the same amount each year. what was the change in grandpa ernie's height each year

Graph each quadratic function and identify its key characteristics. f(x) = x^2 - 2x - 3

Given the equation −4  = 12, solve for x and identify if it is an extraneous solution.