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Playlist PSAT® Math 45 videos

0
James and Steve Rowboat Friendship
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PSAT 1.1 Math Narrative Walkthrough. In how many hours will James and Steve meet?

1
Which Graph Represents the Equation?
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PSAT 1.2 Math Narrative Walkthrough. Which graph represents the equation?

2
Secret Ingredients
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PSAT 1.3 Math Narrative Walkthrough. How many full packages of secret ingredient does the company have to buy to make one 50-gallon batch?

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PSAT 1.4 Math Diagnostic 216 Views


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Description:

PSAT 1.4 Math Diagnostic. Which of the following conclusions is supported by the data in the graph?


Transcript

00:00

Thank you We sneak And here's your shmoop du jour

00:05

brought to you by south africa There are actually not

00:08

as many superheroes living in cape town as you might

00:10

expect Night Check up grab here Which of the following

00:17

conclusions is supported by the data in the graph And

00:20

here the potential answers So what's it asking Well we've

00:26

got four possible conclusions over here but only one of

00:29

them is backed up by the information we've been giving

00:32

The other three can take a flying leap for a

00:34

weekend made up The trick is to figure out which

00:37

three are trying to pull a fast one on us

00:39

let's take them one at a time and see if

00:40

we're buying what they're selling Option b says that as

00:43

chlorophyll increases sea surface temperature increases because they are positively

00:49

correlated That is totally correct on opposite day according to

00:53

the graph As chlorophyll concentration increases sea surface temperature decreases

00:58

that's why is the line moves from left to right

01:00

These numbers here are getting bigger while these were getting

01:03

smaller not unlike our pool of possible answer choices these

01:07

out of here What about c Which suggests that if

01:09

chlorophyll concentration is zero than the sea surface temperature is

01:14

approximately twelve degrees centigrade All right well let's take our

01:17

little finger Actually Any of them will do and find

01:19

the point of the graph at which the concentration of

01:22

chlorophyll is zero right here Looks like that line of

01:25

best fit is hovering A bit over the sixteen degree

01:28

mark which unless mathematicians recently switched it up on us

01:32

is not the same as twelve degrees but we can

01:35

reduce our concentration on choiceseat zero next up is option

01:38

d if the sea surface temperature is less than fourteen

01:40

degrees centigrade the chlorophyll concentration is less than ten well

01:44

here's the part of the graph represented by everything under

01:47

fourteen degrees and if we're to extend our line of

01:49

best bit out of ways we'd see that everywhere it

01:52

falls inside the shaded area the chlorophyll concentration is more

01:56

than ten not less so this option is a shady

01:59

is so new graph will next d answer is the

02:02

right choice If the sea surface temperature is fifteen degrees

02:06

centigrade or phil concentration is likely to be between eight

02:09

point zero and eight point five Yeah here's fifteen degrees

02:13

right along this axis and if we go straight across

02:15

to the line of best fit yet that totally falls

02:18

somewhere between a chlorophyll concentration of between eight and eight

02:21

point five we're really glad we got the right answer

02:24

but we're going to take a break now and lie

02:26

down for a bit Some reason we're seeing dot home

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