Question

Find a thirty - a twenty for the AP -9,-14.-19,-24.......​

Answer 1

Answer:

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Step-by-step explanation:

Let n be the number of terms

d=-5 or (-14-(-5))

twentieth term

a+(20-1)(-5)

-9+19×(-5)

-9-95=-104

thirthieth term

a+(30-1)(-5)

-9+29×(-5)

-9-145= -154

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Answer 2

Given :

• A.P = - 9 , - 14 , - 19 .......

• First term ( a ) = - 9

• Common difference ( d ) = - 5

To Find :

• 30th term of the A.P

• 20th term of the A.P

Solution :

30th term of the A.P

A₃₀ = a + 29d

A₃₀ = - 9 + 29 × ( - 5 )

A₃₀ = - 9 - 145

A₃₀ = - 154

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20th term of the A.P

A₂₀ = a + 19d

A₂₀ = - 9 + 19 × ( - 5 )

A₂₀ = - 9 - 95

A₂₀ = - 104