The rate law for a hypothetical reaction is rate = k [a]2. when the concentration is 0.10 moles/liter, the rate is 2.7 × 10-5 m*s-1. what is the value of k? a. 2.7 × 10-3 b. 2.7 × 10-3 m-1s-1 c. 7.2 × 105 m-1s-1 d. 2.7 × 10-4 m-1s-1

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