What is the first term if term 15 is -67 and term 21 is -97?

3

Step-by-step explanation:

The n th term of an arithmetic sequence is

= a +(n - 1)d

where a is the first term and d the common difference

Given the fifteenth term is - 67, and term 21 is - 97, then

a + 14d = - 67 → (1)

a + 20d = - 97 → (2)

Subtract (1) from (2) term by term

6d = - 30 ( divide both sides by 6 )

d = - 5

Substitute d = - 5 into (1)

a + 14(- 5) = - 67

a - 70 = - 67 ( add 70 to both sides )

a = 3

Thus the first term is 3

step-by-step explanation:

it's is b

step-by-step explanation:

and 90% of people marry there 7th grade love. since u have read this, u will be told good news 2night. if u don't pass this on nine comments ur worst week starts now this isn't fake. apparently if u copy and paste this on ten comments in the next ten minutes you will have the best day of ur life tomorrow. you will either get kissed or asked out in the next 53 minutes someone will say i love u

read more on -