Aclub of twenty students wants to pick a three person subcommittee. how many ways can this be done?

Step-by-step explanation:

Combinations : If we want to choose items out of items, and order of the selection does not matter.

possible ways

Total number of students

Persons in subcommittee

Here order of selection does not matter, so we can use combination to get possible number of ways.

Number of ways

56

step-by-step explanation:

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