For what value of x is the rational expression below undefined?

(3x-12) / (9-x)

To choose a sample for a survey of seventh graders, the student council puts pieces of paper with the names of all the seventh graders in a bag and selects 20 names. Is it ransom sample or a biased sample. Explain.

100 students attended a school carnival. If 60% of the students were less than 10 years old and 75% of the students were over 6 years old, how many children were between 6 and 10 years old?

Tom wants to tile the floor in his kitchen, which has an area of 320 square feet. In the store, the smallest tile he likes has an area of 1.1 square feet and the largest tile he likes has an area of 1.815 square feet.

Linear function graph and table Your movie ticket costs $12. Each bag of popcorn costs 3$. What is the Equation. Table And Graph of this lineat function

A national pizza chain collected data from 200 stores about pizza orders on a busy Saturday. The number of pizzas ordered from 15 random stores is below.

Today, I am making a triangle-shaped sandbox for my sweet, little Maci. Papa gave me 30' in length of 2"x 4' planks. I would like the longest side to be 12'. What is one possible combination for the other two sides? (show work)

Thaddeus traded $3750 for British pounds, immediately changed his mind, and then promptly traded his British pounds back into dollars. Which of these amounts is he most likely to have?

If the median of five consecutive even integers is 20, what is the value of the smallest integer?

4,13,31,67 ___ What's the rule?

How many odd numbers are greater than 4 but less than 25?