Abag contains 1 gold marbles, 8 sliver marbles, and 30 black marbles. someone offers to play this game: you randomly select one marble from the bag. if it is gold, you win $4. if it is silver, you win $2. if it is black, you lose $1. what is your expected value if you play the game?

x + y = 90 5x – 10y = 90 90 – 10y = 5x 90 + 10y = 5x

step-by-step explanation:

last month maria hiked the 5-mile mountain trail a number of times and she hiked the 10-mile canal trail several times. let x represent the number of times she hiked the 5-mile trail, and let y represent the number of times she hiked the 10-mile trail. if she hiked a total of 90 miles, which equation can be used to find the number of times maria hiked each trail? x + y = 90 5x – 10y = 90 90 – 10y = 5x 90 + 10y = 5x

c. 6tan80

step-by-step explanation: