Question

What is the mean of the data set?

125, 141, 213, 155, 281

Answer 1

@Vocaloid

Answer 2

there are 5 numbers so simply add them up and divide by 5

Answer 3

ok

Answer 4

183?

Answer 5

good, that's the answer

Answer 6

i solved that one a while ago, im getting the new question

Answer 7

using the table we see that studying with music for more than an hour --> 9 people
total number that studied with music --> 9 + 6

so 9/(9+6) --> simplify to get your ans

Answer 8

0.60?

Answer 9

good

Answer 10

select the graph where the arrow starts at 850 exactly and the arrow stops at year 10

Answer 11

actually this is kind of a bad question, the only graph that starts at 850 is C (arrow stops at 9 for some reason?) so I would pick that one

Answer 12

notice how f(x) keeps getting bigger and bigger as x increases, and gets smaller and smaller as x decreases

which answer choice matches?

Answer 13

b?

Answer 14

as x decreases, f(x) is getting smaller and smaller

Answer 15

D then?

Answer 16

as x increases, f(x) is getting bigger (increasing)

Answer 17

oh, its A,

Answer 18

good, well done

Answer 19

when you plug in x = 0 you get 12 which means the graph crosses (0,12) (making A and D the only choices)

try plugging in x = 2 into the function to see whether to pick A or D

Answer 20

wait, so which one?

Answer 21

A or D?

Answer 22

\(\color{#0cbb34}{\text{Originally Posted by}}\) @Vocaloid
when you plug in x = 0 you get 12 which means the graph crosses (0,12) (making A and D the only choices)

*** try plugging in x = 2 into the function to see whether to pick A or D ***
\(\color{#0cbb34}{\text{End of Quote}}\)

Answer 23

evaluate the function at x = 2.

Answer 24

you are given f(x) = 2x^2 - 10x + 12

plug in x = 2 and find f(x)

then use the result to determine which graph contains that point

Answer 25

i did that and got D

Answer 26

idk if i did it wrong or anything

Answer 27

good, D is correct because x = 2, f(x) = 0 and (2,0) is on the graph D

Answer 28

pick two points and calculate (change in y)/(change in x)

for example:

(0,-1) (3,0)

how much does y increase by? how much does x increase by?

Answer 29

i did that and got B

Answer 30

what did you get for the change in y?

Answer 31

oh, i havent done that, lemme do that

Answer 32

yeah, i still dont get it

Answer 33

y increases from -1 to 0

how much did it increase?

Answer 34

1?

Answer 35

good

now, x changes from 0 to 3, how much did it increase?

Answer 36

3

Answer 37

good, so change in y/change in x = (1/3)

making the slope 1/3

which eliminates every answer choice except...?

Answer 38

D?

Answer 39

excellent, D is the answer

Answer 40

is would be D too right?

Answer 41

over the interval 1 <= x <= 4, x increases from 1 to 4 and y increases from 4 to 13

so change in y/change in x = (13-4)/(4-1) = ?

Answer 42

9/3

Answer 43

good, and 9/3 = 3 = your ans

Answer 44

18 of 24 Items

The equation y=58−x represents the temperature, y, in degrees Fahrenheit and the time, x, in hours from 6 p.m. to 9 a.m. on a certain day.

Let x = 0 represent the temperature at 6 p.m.

What is the average rate of change in temperature from 6 p.m. to 9 a.m.?




−1°F per hour

−2°F per hour

1°F per hour

2°F per hour

Answer 45

simply find the slope of y = 58 - x

you can re-write this as y = -1x + 58 and compare with y = mx + b to identify what m is

Answer 46

i got B

Answer 47

for an equation written in the form y = mx + b, m is the slope. m is the number being multiplied to x.

apply this logic and find the slope of y = -1x + 58

Answer 48

i'll try

Answer 49

closest i got was near D, i dont think it's right..

Answer 50

try not to look at the answer choices and think about the math

if the equation looks like y = mx + b, the number m, which is being multiplied to x, is the slope

now, we look at y = -1x + 58

which number is being multiplied to x?

Answer 51

-1

Answer 52

good, so that's the slope

-1 deg F is your answer

Answer 53

okay

Answer 54

just start plugging in x values to see which table matches up

for example, when x = -2, what is the value of f(x)?

Answer 55

6?

Answer 56

good

now find the value of g(x) when x = -2

Answer 57

is it 0

Answer 58

good

now select the answer choice where f(x) = 6 and g(x) = 0 when x = -2

Answer 59

that would be B?

Answer 60

excellent, good work

Answer 61

can you open a new question, this one is starting to lag

Answer 62

i can tell