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rojina83
09.07.2019 •
Mathematics
The length of a rectangular piece of land is 12cm more than four times its width. the perimeter is 74cm. find its dimensions
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Ответ:
length = 32 and width = 5
let the width = w then length = 4w + 12
perimeter = 2 ( length + width )
= 2( 4w + 12 + w ) = 2( 5w + 12 ) = 10w + 24
perimeter = 74
solve 10w + 24 = 74
subtract 24 from both sides
10w = 74 - 24 = 50 ⇒ w = 5
width = 5 and length = (4 × 5) + 12 = 20 + 12 = 32
Ответ:
If you would like to know what will the approximate population be after 3 years, you can calculate this using the following steps:
an initial population ... 298 quail
an annual rate ... 8%
an exponential function to model the quail population:
f = 298(1+8%)^t = 298(1+8/100)^t
f ... quail population
t ... time (years)
t = 3 years
f = 298(1+8/100)^t = 298(1.08)^3 = 375.4 quail
375.4 quail after 3 years.