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

deez nu tz

step-by-step explanation:

70

step-by-step explanation: