Need help with Question seven, on the topic of trigonometric functions.

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

Which best explains why this triangle is or is not a right triangle ?

If t8 = 4 and t12 = −2, find the first three terms of the arithmetic sequence.