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find a1 for an arithmetic sequence in which q10 = 2 and d =_1

Sagot :

Kirscheid

a1 = 11

Step-by-step explanation:

an = a1+(n-1)d

2 = a1 +(10-1)(-1)

2 = a1 + 9(-1)

2 = a1 – 9

2+9 = a1

11 = a1

a1 = 11

Checking: Solve for a10

an = a1+(n-1)d

a10 = 11 + (10-1)(-1)

a10 = 11 +9(-1)

a10 = 11 – 9

a10 = 2✅

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