8. An oil company bores a hole 120 m deep. Esti- mate the cost of boring if the cost is £70 for drilling the first metre with an increase in cost of £3 per metre for each succeeding metre.

Elementary Geometry For College Students, 7e
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ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
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26.8) Arithmetic progressions

8. An oil company bores a hole 120 m deep. Esti-
mate the cost of boring if the cost is £70 for
drilling the first metre with an increase in cost
of £3 per metre for each succeeding metre.
Transcribed Image Text:8. An oil company bores a hole 120 m deep. Esti- mate the cost of boring if the cost is £70 for drilling the first metre with an increase in cost of £3 per metre for each succeeding metre.
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