2 years ago

See attachment for question, please help asap

Mathematics

1 answer:

natulia [17]2 years ago

6 0

Answer:

You add on the equation like the example below

Step-by-step explanation:

The sequence is an arithmetic one with first term a1=−4 and difference d=2 . To calculate a9 we use the formula: an=a1+(n−1)⋅d. Here we have: a9=−4+(9−1)⋅2=−4+8⋅2=−4+16=12.

You might be interested in

Write the first five terms of the geometric sequence in which a1=8 and the common ratio is -1/2.

Oliga [24]

Answer:

First five terms are:

8 , (-4) , 2 , (-1) , (1/2)

Step-by-step explanation:

$a_{1}=8 \\\\r = \frac{-1}{2}\\\\a_{2}=\frac{-1}{2}*a_{1}= \frac{-1}{2}*8= -4\\\\a_{3}=\frac{-1}{2}*a_{2}=\frac{-1}{2}*-4=2\\\\a_{4}=\frac{-1}{2}*a_{3}=\frac{-1}{2}*2=-1\\\\a_{5}=\frac{-1}{2}*a_{4}=\frac{-1}{2}*-1=\frac{1}{2}$