Which of the following is NOT a rational number?

In the diagram below, abc is congruent to dec what is the value of x

The scatter plot shows the number of animal cells clara examined in a laboratory in different months: plot ordered pairs 1, 20 and 2, 60 and 3,100 and 4, 140 and 5, 180 what is the approximate predicted number of animal cells clara examined in the 9th month?

The table showed price paid per concert ticket on a popular online auction site. what was the average price paid per ticket