Which statement best explains why Kyle's survey may be biased? O It wasn't possible for students to volunteer to take the survey.
Kyle gave the survey on paper instead of electronically.
Two out of every three students entering Kyle's class didn't receive the survey.
Only students who are taking one of Kyle's classes received the survey.

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.

Sun country bus lines has 80000 shares of stock outstanding what would the dividend per share of stock be from a dividends declaration of 109600