Which relationship is always true for the angles r, x, y, and z of triangle ABC? (4 points)
B
1) x + z = y
2) 180 degrees - x=r
O 3) x + y + z = 180 degrees
O4) x + y + z = 90

Can someone show me the steps to solve the problem?

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

Anew shopping mall is gaining in popularity. every day since it opened, the number of shoppers is 5% more than the number of shoppers the day before. the total number of shoppers over the first 10 days is 1258 how many shoppers were on the first day?