Math, asked by nayanmahendrakar24, 1 month ago

Ramkali saved 5 in the first week of a year and then increased her weekly savings by 1.75. If in the nth week, her weekly savings become 20.75, find n.​

Answers

Answered by sarveshjajoo
0

Answer:

Step-by-step explanation:

The given problem forms an AP with first term=5

d=1.75

Sum=20.75

20.75=n/2(2a+(n-1)d)

20.75=n/2(10+1.75n-1.75)

41.5=10n+1.75n^2-1.75

1.75n^2+10n-43.75=0

use n=-b+Sqrt(b^2-4ac)/2a to solve

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