unite the following permutation & combination in terms of factorials, then evaluate: 5pts) b) is a) 22) Write the following factorials in terms of permutation or combination, then evaluate: (5pts) 70! 70! a) b) 8!62! 65! ​

Aboat has a speed of 9 mph in calm water. it takes the boat 4 hours to travel upstream but only 2 hours to travel the same distance downstream. which equation can be used to find c, the speed of the current? 2(9 – c) = 4(9 + c) 9 + c = 4(9 – c) 9 – c = 2(9 + c) 4(9 – c) = 2(9 + c)