How do I decide whether a relation is a function or not?

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.

copy each statement. Insert plus, minus, times, division to make each statement true. 33 3 2 5 = 1

X+Y=100 4.5X+20Y=822 Elimination, graphing, and substitution methods.

It took Sharon 4 hours to drive to her grandmother's house. Her grandmother lives 140 miles from Sharon. What was Sharon's average speed for this trip? A: 30 mph B: 35 mph C: 136 mph D: 560 mph

Amy sold 8 large quilts and 1 baby quilt. How much money did she make from selling quilts?

Scott took out a 72 - month loan for 42000 to put a new pool in his background. If the simple interest rate is 6.75% how much will he pay in total?

What is the product of (8.8 * 10^6) (5 * 10^2) ?

Find the two positive numbers that satisfy the given requirements: "The sum is S and the product is a maximum."

Write an equation of the line that passes through (7,10) and is perpendicular to the line y=1/2x-9.

3 pounds of trill mix put into 8 bags equally what will each bag have