Question

find a30 - a20 for -9,-14, -19, -24 ....​

Answer 1

Answer:

-45

Step-by-step explanation:

Here, a = -9

d = -5

a30 - a20 = (a+29d)-(a+19d)

= a+29d-a-19d

= 9d

= 9×(-5)

= -45

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Answer 2

a= -9 , d= -14 - -9 = -5

a³⁰ = a+ 29d = -9+ 29×-5 = -9 -145 = -154

a²⁰ = a+19d = -9 +19 × -5 = -9 -95 = -104

a30 - a20 = -154 -104 = -285