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PSAT 1.37 Math Diagnostic. Which of the following forms of the function f(x) would best reveal the number of employees that should be hired to maxi...
PSAT 1.28 Math Diagnostic 178 Views
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Description:
PSAT 1.28 Math Diagnostic. What is the maximum number of text messages he can send in one month for Plan B to cost no more than Plan A?
More Video DetailsTranscript
- 00:00
Thank you We sneak And here's your shmoop too sure
- 00:05
brought to you by text messages every time we see
- 00:08
an abbreviation we don't recognize we always wonder whether we're
- 00:11
just really out of touch or someone's cat walked across
- 00:14
their iphone Mr abdul is choosing between two cellphone plans
Full Transcript
- 00:19
plant a charge is a flat fee of three bucks
- 00:21
a month and twenty cents per text message Plan b
- 00:24
charges sixty cents per text message but offers a monthly
- 00:27
rebate of seven bucks if mr abdul chooses plan b
- 00:31
what is the maximum number of text messages he consented
- 00:34
one month Or plan b to cost no more than
- 00:38
plan a And here the vigilante All right we'll wait
- 00:42
Is mr abdul buying his phone for himself or for
- 00:45
his fourteen year old daughter kelly Because she just got
- 00:48
dumped by jonathan reynolds his past sunday and she is
- 00:51
gonna have a lot of texting to do over the
- 00:53
next few weeks We're just saying i'm looking out for
- 00:56
you there mr f okay so we're looking at options
- 00:58
of zero for eight twenty five spoof we're really hoping
- 01:01
the correct answer is d because we pretty much just
- 01:04
sent a text messages By the time we walked out
- 01:06
on the horizon story waken rewrite plan a is a
- 01:09
linear equation and any time we make a word problem
- 01:12
look matthew well that's a good start so let's just
- 01:15
do it since it twenty cents for a message and
- 01:17
a number of messages is what we don't know We
- 01:20
can call that point two x one x would be
- 01:23
a whole dollar and then tack on a plus three
- 01:26
for three dollars monthly charge so we get point two
- 01:28
x plus three Well plan b is sixty cents per
- 01:31
message with a seven dollars monthly rebate So point six
- 01:34
x minus seven now we're trying to figure out where
- 01:37
these two would meet in the middle cost wise so
- 01:39
let's set him equal to each other Tothe point two
- 01:41
x plus three equals point six x minus seven we
- 01:44
can add seven of both sides to get point two
- 01:47
x plus ten equals point six x then subtract point
- 01:50
two x from both sides to get ten equals point
- 01:53
for x and finally divide both sides by point for
- 01:56
to get x equals twenty five which is option d
- 01:59
mister ray we strongly suggest you just go with plan
- 02:02
a So you can text to your heart's content without
- 02:04
breaking the bank Then again if this for kelly we
- 02:07
might actually recommend plan c hu tin cans and a 00:02:09.98 --> [endTime] length of string Your wallet will thank you
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