The average rate of the first part of yi’s walk on a park loop was 4 miles per hour. she then met up with a friend and the two walked the rest of the way at an average rate of 5 miles per hour. the entire 3-mile walk took yi 42 minutes (0.7 hour). which equation can be used to solve for x, the time in hours that yi spent walking before meeting her friend? x = 0.7 – x x + (0.7 – x) = 1 4x + 5(0.7 – x) = 1 4x + 5(0.7 – x) = 3

Total distance covered = 3 miles.

First part walked at the rate 4 miles per hour.

Let us assume x hours was walked in first part.

Total distance covered in x hours at the rate 4 miles per hour = 4x.

Second walk rate with meet with friend = 5 miles per hour.

Total time taken = 0.7 hours.

Therefore, time taken in second walk only = (0.7 - x) hours.

Distance covered in second walk = 5 (0.7 - x).

Total distance covered = distance covered in first part + distance covered in second part.

4x + 5 (0.7 - x) = 3 miles.

Therefore, correct option is  4x + 5(0.7 – x) = 3.

Hello! i hope this
since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.