Question

Medal Alert !!!!!
The graph below plots a function f(x):


If x represent time, the average rate of change of the function f(x) in the first three seconds is ___.

Answer 1

@amistre64

Answer 2

what is the slope of the line between t=0, and t=3?

now that i look at the graph, the slope is the same thruout ... so what is the slope of the line?

Answer 3

1/2 ?

Answer 4

im gona have to ask how you determined that ...

as i see it, f(x) moves from 100 to 140 as x moves from 0 to 1

so the rate of change to me is 40 per second

Answer 5

because i was finding the slope thats how i got 1/2 .. so your saying the answer is 40 ?

Answer 6

still wondering how you find a slope that gets you 1/2 :)

if anything: f(0) - f(3)
--------
0 - 3


100 - 220
---------
-3


120/3 = 40

Answer 7

since the slope of a line tells us the rate of change of f(x) with respect to x, as x changes by 1, f(x) changes by 40. the slope of the line is 40.

Answer 8

ohhhh ok :) thx may you help me w/ 2 more please ??

Answer 9

maybe .... just maybe

Answer 10

lol ok



Choose the equation below that represents the line passing through the point (-3, -1) with a slope of 4.

y - 1 = 4(x - 3)

y + 1 = 4(x + 3)

y - 3 = 4(x + 1)

y + 3 = 4(x - 1)

Answer 11

any ideas?

Answer 12

im thinking that it is b or a

Answer 13

its is one of those, keep in mind that the point has to fit, so which one makes a true statement for the point (-3,-1)

-1 - 1 = 4(-3 - 3)
or
-1 + 1 = 4(-3 + 3)

Answer 14

is it A ?

Answer 15

-1 - 1 = 4(-3 - 3), does this ring true?

Answer 16

ohh no im sorry its b

Answer 17

b works fine, you were trying to recall a pattern for the point slope form of a line :)

given a point (a,b) and a slope m, the form takes on: y-b = m(x-a)

Answer 18

yayy thanks but this is one more

Choose the equation of the line passing through the point (-1, 3) and perpendicular to y = -1/3x + 7.
y = 3x - 12

y = 3x + 6

y = 3x - 6

y = 3x

Answer 19

its best to just plug in the point since that all have the same slope defined for them

Answer 20

the x=-1, y=3 ..... which one fits?

Answer 21

what do it haves to equal to ?

Answer 22

it has to equal ... the point tells us that x=-1, and y=3

sub in those values for x and y and see what option is true

Answer 23

ohh ok hold on

Answer 24

is it C

Answer 25

lets chk

y = 3x - 6

3 = 3(-1) - 6

3 = -9 im gonna say thats not it, close tho

Answer 26

aww ok hold on

Answer 27

so does that make it b

Answer 28

y = 3x + 6, yes

3 = 3(-1) + 6

3 = 3 is good

Answer 29

yayyy thanks so much but can you help w/ just 2 more and i promise that will be it

Answer 30

i have to be moving on, ask them in a new question and your bound to get replies

Answer 31

thanks