How many committees with 5 members can be chosen from a group of 18 people? *

Please help

What is the 12th term of b(n)=-4-2(n-1)

The sum of these consecutive integers is equal to 9 less than 4 times the least of the integer. find the three integers

Which answer goes into the box? (90° clockwise rotation, 90° counter clockwise rotation, translation, or glide reflection)