Given f(x) = the quantity of 5x plus 1, divided by 2, solve for f-1(8) PLZ HELP
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OpenStudy (anonymous):
@$oumya
OpenStudy ($oumya):
is it f^-1(8)??
OpenStudy (anonymous):
yeah
OpenStudy (anonymous):
??
OpenStudy (anonymous):
@sochittasal
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OpenStudy (anonymous):
@xapproachesinfinity
OpenStudy (anonymous):
\[5x+1/\]
OpenStudy (anonymous):
5x+1/2
OpenStudy (anonymous):
f^-1(8)
OpenStudy (xapproachesinfinity):
oh you want f inverse if im not wrong?
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OpenStudy (anonymous):
i guess i dont know how to do it
OpenStudy (anonymous):
i think you find the inverse then solve for x
OpenStudy (anonymous):
well 8
OpenStudy (xapproachesinfinity):
ok, give a minute to find the f inverse and evaluate it at 8
OpenStudy ($oumya):
i think it will 3
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OpenStudy (anonymous):
how do you know that
OpenStudy (xapproachesinfinity):
the answer is 15/8
OpenStudy (anonymous):
my options are
3
7
10
20
OpenStudy ($oumya):
y=f(x)=(5x+1)/2
in the case of f^-1(x) there x and interchanges
we know
y= (5x+1)/2
x=(5y+1)/2
f^-1(x)=(2x-1)/5
for f^-1(8) it will be {2*8-1}/5 =3
ok?
OpenStudy (xapproachesinfinity):
im sorry it is 15/5 which 3 as soumiya said
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OpenStudy (anonymous):
thx can you help me with more plz
OpenStudy (anonymous):
What is the equation of a horizontal line passing through the point (2, 10)?
y = 12
x = −8
y = 10
x = 2
OpenStudy (xapproachesinfinity):
i did a typo haha
OpenStudy (xapproachesinfinity):
it is 10
OpenStudy (anonymous):
The function d(x) = 3x + 2 determines how many donuts need to be purchased for a meeting, where x is the number of people at the meeting. The office manager uses h(d(x)) to find the amount of money to bring for the donut purchase. The function h(x) = 2x + 7. Solve for how much money to bring when there are 8 people in the meeting.
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OpenStudy (anonymous):
i got 59 is it correct
OpenStudy (xapproachesinfinity):
since it passes through the point (2.10)
OpenStudy (anonymous):
ok so
OpenStudy (anonymous):
can you help with the other problem
OpenStudy (xapproachesinfinity):
yes correct
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