Please help me answer this

Which ratio is equivalent to 10: 85

In the following situation, determine whether you are asked to determine the number of permutations or combinations. then do the calculation how many ways are there to pick a starting five from a basketball team of twelve members? a. permutation; ps - 2520 b. combination; 1c, - 792 c. combination: 2cs - 2520 d. permutation; ps - 95040

Identify an equation in point slope form for the line perpendicular to y=3x+5 that passes through (4,-1)