I need help with these questions

Translate the word phrase into a math expression. 15 fewer than the product of 4 and a number. (pls immediately)

Given the points a(-2, 1) and b(8, 6), find the coordinates of the point c on directed line segment ab, that partitions ab in the ration 2: 3.

Anature center offer 2 guided walks. the morning walk is 2/3 miles. the evening walk is 3/6 mile. which is shorter