Question

Fifth term of an arithmetic sequence is 20 . What is the sum of first term and nineth term of this sequence?​

Answer 1

Answer:

see below

Step-by-step explanation:

The fifth term of an arithmetic sequence is 20⇒20÷5=4

so the first term is 4

therefore, first term + ninth term⇒ 4+4×9

                                                     ⇒4+36

                                                     ⇒40