Simplify the expression 6C5
a. 6
b. 24
c. 30
d. 720

A

Step-by-step explanation:

Using the definition

n =

where n! = n(n - 1)(n - 2)....... × 3 × 2 × 1

6 =

      = ← cancel 5(4)(3)(2)(1) on numerator/ denominator, leaving

      = 6

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

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step-by-step explanation: