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Emieloy2959
01.07.2019 •
Mathematics
Write and solve a real world problem in which you need to find the initial value of the function. then explain how you solved the problem
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Ответ:
you are planting roses
you started at 12 noon
at 3pm, you have 80 roses left
at 6pm, you have 20 roses left
if you planted roses at a constant rate, how many roses did you start with?
so we can find the slope of this linear function as (20roses-80roses)/(6pm-3pm)=60roses/3hrs=-20roses/hr
your quantity goes down by 20 roses per hour (you plant 20 per hour)
r=-20t+?
find ?, the number of roses when t=0
at 3pm yo have 80 roses
80=-20(3)+?
80=-60+?
140=?
you had 140 roses intiailly
if you wanted an exponenntial
the town polpulationn grows at an exponential rate
the town was founded in 2000
in 2010, the town's population was 1000
in 2015, the town's populationw as 2000
find intial polpulation
exponential can be modeled by
where y=population, t=time and b and a are constants (a=initial population)
we are given that after 10 years (2010), y=102400
after 15 years, (2015), y=3276800
so
divide the 2nd by the first equation, remembering our exponential properties like![\frac{x^a}{x^b}=x^{a-b}](/tpl/images/0037/7148/78c7e.png)
take 5th root of both sides
subsitute back
the intial population is 100 people
Ответ:
x^2 - 2x - 13/4 = 0...add 13/4 to both sides
x^2 - 2x = 13/4 ...take half of ur x term, square it, and add it to both sides
x^2 - 2x + 1 = 13/4 + 1
(x - 1)^2 = 17/4
x - 1 = (+-) sqrt (17/4)
x = 1 (+-) sqrt (17/4)
x = 1 + (sqrt 17) / 2 <==
x = 1 - (sqrt 17) / 2 <==
I dont know what steps she made, but here is how I would do it.