Need answer asap, will award brainest for the person who most shows work a bag contains 25 marbles of the same size that are yellow, green, and purple. the probability of picking a yellow marble is 20%. the probability of picking a green marble is 50%. determine the probability of picking a purple marble from the bag and then classify the probability of picking a purple marble as likely or not likely to occur. show evey step

The fence around a quadrilateral-shaped pasture is 3a^2+15a+9 long. three sides of the fence have the following lengths: 5a, 10a-2, a^2-7. what is the length of the fourth side of the fence?

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.

Which expression is equivalent to 64 - 9x^2?