Determine if the graph is symmetric about the x-axis, the y-axis, or the origin. r = 2 cos 3θ

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.

Fracisco's game involves 3 green, 2 yellow, 4 red, and 3 black marbles. if he randomly draws three marbles from the bag, without replacement, what is the probability that he will draw yellow, and then red, and then black? a)1/192 b)1/72 c)3/220 d)1/55

Rick and jim are working at the concession stand at the school basketball game. rick sells 12 more burgers than jim. the equation given below shows this relationship, where g represents the number of burgers rick sells, and h represents the number of burgers jim sells. g= h + 12 if rick sells 37 burgers, how many burgers does jim sell?