Abag contains 80 marbles: 20 red, 20 blue, 20 yellow, and 20 green. what is the probability that the first 4 marbles randomly selected, without replacement, are all different

Last saturday, the museum box office sold 281 tickets for a total of $3,954. adults ticket cost $15, and students ticket cost $12. how many of each kind of tickets were sold?

Acamper leaves camp on a kayak and travels 50 miles east on a river, then he ties his kayak to the bank and travels 20 miles north on a bicycle. this trip can be plotted on the coordinate plane, where the camp is the point (0, 0). the distant of the camper to the camp can be found using the distance formula. which other formula can he use? a) 502 - 202 b) 502 + 202 c) 502 - 202 d) 502 + 202

What is the result of adding the system of equations? 2x+y=4 3x-y=6