Christina is buying a skirt for $35.95, a pair of jeans for $25.98 and a t-shirt for $11.50. Find the total cost of the items not including sales tax.

Which one ? is the answer and how to find this answer

Prove sin2a + cos2a - 1 / sin2a + cos2a + 1 = 1 - tana / 1 + cota

Suppose you are choosing a 6-digit personal access code. this code is made up of 4 digits chosen from 1 to 9, followed by 2 letters chosen from a to z. any of these digits or letters can be repeated. find the total number of personal access codes that can be formed. 492,804 341,172 39,917,124 4,435,236