A bag contains 8 white, 5 blue, and 7 red marbles. A marble is chosen from the bag, without replacement (you keep the first marble), and another marble is chosen. Draw as sample space and answer the questions below:

Find P(both red)=

Find P(first marble is red and the second is blue)=

Find P(both blue)=

Find P(neither is red)=

65% of students in your school participate in at least one after school activity. if there are 980 students in you school, how many do not participate in an after school activity?

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.

(x-5)1/2+5=2 what is possible solution of this equation