Give the arithmetic sequence of 5 terms if the first term is 8 and the last term is 100.

2) Which term of the arithmetic sequence is-18, given that a, 7 and a₂ = 2?

3) What are the first and last terms of an arithmetic sequence when its means are 35, 15 and -5?

4) What is the geometric mean between k and ?

5) During an initial phase of an outbreak of measles, the number of infections can grow geometrically. If there were 4, 8, 16... on the first three days of the outbreak, how many will be infected on the 7th day?​