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PSAT Math Videos 28 videos
PSAT 1.1 Math Diagnostic. If a rabbit consumes 3 meals a day, how many grams of food will a rabbit consume in 7 days?
PSAT 1.1 Math Narrative Walkthrough. In how many hours will James and Steve meet?
PSAT 1.10 Math Diagnostic. Which of the following is a factor of the expression?
PSAT 1.31 Math Diagnostic 177 Views
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Description:
PSAT 1.31 Math Diagnostic. Which of the following must be equivalent to the equation?
More Video DetailsTranscript
- 00:00
Thank you We sneak And here's your smoke too Sure
- 00:05
brought to you by equivalent expressions like how good morning
- 00:09
in america means the same thing as bugger off in
- 00:13
england We really need to take a trip back there
- 00:15
one day Everyone's So friendly All right which of the
Full Transcript
- 00:17
following must be equivalent Tio this thing's equals a b
- 00:20
over tea and hear the potential answers there Okay so
- 00:24
we're looking for something that's equivalent to see equals a
- 00:27
b over d i see something that says exactly the
- 00:30
same thing but in a different way Variety is the
- 00:33
spice of life after all Or maybe that's oregano We're
- 00:36
always getting those two Okay first thing will probably want
- 00:39
to do is get that d out of the denominator
- 00:43
on the righthand side So as always we can multiply
- 00:45
both sides to get d somewhere more manageable Doing this
- 00:49
we get cd equals a b Well if cd equals
- 00:53
a b then option c will be true when d
- 00:55
equals one for example But most of the time there's
- 00:58
no way These two will be equivalent So we can
- 01:01
nick see option d looks sort of similar to what
- 01:03
we came up with But it's pulled the old switcheroo
- 01:06
with a and c so it's not d either option
- 01:09
a suggests that c equals d over a b but
- 01:11
isolate see we'd have to divide Both sides are new
- 01:14
equation by d and we'd wind up with exactly what
- 01:17
we started with a b over D is definitely not
- 01:20
the same thing as thie over a bee so we're
- 01:22
not going to be taken in by option a is
- 01:24
charms however if we divide both sides by sea we
- 01:28
get b equals a b oversee which is option b
- 01:32
though there's our equivalent expression And by the way any
- 01:34
of you know what it means When someone in ireland
- 01:37
says yeah we couldn't find it in our irish to 00:01:40.437 --> [endTime] english dictionary anyway so it's no fair
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