Question

Find the 20th term of the A.P.-40, -15, 10,...​

Answer 1

Answer:

a=t1=-40

=t2=-15

=t3=10

d= t2-t1= -15-(-40)= -15+40=25

t20=?

tn=a+(n-1)d

t20= -40+(20-1)25

t20= -40+(19)25

t20= -40+475

t20= 435

Therefore,

The 20th term is 435.

Step-by-step explanation:

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