What is the expected value of answering a 4 options multiple-choice question? What is the expected value if you answer 8 of this kind of questions? If you answered the question correctly, you earn 4 points. If you did not answer the question correctly, you lose 2 points.

Kayla has a $500 budget for the school party. she paid $150 for the decorations. food will cost $5.50 per student. what inequality represents the number of students, s, that can attend the party?

Last one and the bottom answer choice is y=(x-4)^2+1 you guys!

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.