Of 2,000 students surveyed, 80% indicated that they commute to school each day. of those that commute to school each day, 83% spend more than $25 a week on gasoline. of those that do not commute to school each day, 95% indicated that they do not spend more than $25 a week on gasoline. a student surveyed is chosen at random. 4. what is the probability that this student does spend more than $25 a week on gas, given that he/she does commute to school each day?

If x = 12 and y = 3, what is the value of x - y 2? 81 6 3 18

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?

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.