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1. Helen sprays a weed killer to treat the weed problem in her lawn. The numb 100 hectare (ha) remaining after t days is modeled by N=20+ weeds/ha. t+2 How many weeds per ha were alive before the spraying? How long will it take for the number of weeds decrease to half of its origina (a) (b) 11:11 1:11 11

1. Helen sprays a weed killer to treat the weed problem in her lawn. The numb 100 hectare (ha) remaining after t days is modeled by N=20+ weeds/ha. t+2 How many weeds per ha were alive before the spraying? How long will it take for the number of weeds decrease to half of its origina (a) (b) 11:11 1:11 11

Advanced Engineering Mathematics
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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1. Helen sprays a weed killer to treat the weed problem in her lawn. The number of weeds per 100 hectare (ha) remaining after t days is modeled by N=20+ weeds/ha. t+2 (a) How many weeds per ha were alive before the spraying? (b) How long will it take for the number of weeds decrease to half of its original amount? According to the model, is this weed killer going to kill all weeds?
Transcribed Image Text:1. Helen sprays a weed killer to treat the weed problem in her lawn. The number of weeds per 100 hectare (ha) remaining after t days is modeled by N=20+ weeds/ha. t+2 (a) How many weeds per ha were alive before the spraying? (b) How long will it take for the number of weeds decrease to half of its original amount? According to the model, is this weed killer going to kill all weeds?
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