Please help me find the answer to this math question

Find the number of positive three-digit even integers whose digits are among 9, 8, 7,5, 3, and 1.

The perimeter of a triangle is 69 cm. the first is 5 cm shorter than the second side. the third side is twice as long the first side. find the length of each side

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.