Question

LAST QUESTION FOR YEAR!!!!!
HELP PLEASE!!!
The temperature of a chemical reaction ranges between 20°C and 160°C. The temperature is at its lowest point when t = 0, the temperature is 90 degrees and increasing. What is a sine function that would model this reaction?

Answer 1

f(x) = 90 sin pi/4 x + 70

f(x) = 70 sin pi/4 x + 90

f(x) = 70 sin 8x + 90

f(x) = 90 sin 8x + 70

Answer 2

t is y values amiright?

Answer 3

Yes? I'm not 100 percent sure this is all the info it gives me

Answer 4

you have a graphing calc?

Answer 5

I do!

Answer 6

well we could be really bad and plug each of them in and see which graph has the smallest value when x approaches y=0

Answer 7

could I use wolfram for this? or does it have to be on my graphing calc?

Answer 8

or when x=0

Answer 9

probably could use wolfram

Answer 10

nvm wolf ram just gives line equations

Answer 11

oh yea...

Answer 12

can you do it? I'm trying but I have Noooooo idea how to

Answer 13

make sure ur calculator is in radian measures when you plug this in

Answer 14

which calc do u have?

Answer 15

ti-84 pluc c silver

Answer 16

i walk u through the steps but i do not own that calc

Answer 17

ok! i'll try! I made sure its in radians

Answer 18

now what?

Answer 19

what point are you at?

Answer 20

wdym? I typed in the equation and I got 74.82118

Answer 21

the first one

Answer 22

are you in the graphing section of your calc?

Answer 23

OH SNAP

Answer 24

t means time and time is ALWAYS THE INDEPENDENT VARIABLE

Answer 25

so when x=0 the graph should be at its lowest point

Answer 26

um OK!!!!! hahahaha

Answer 27

sorry im retarded now i think i can answer this question

Answer 28

so you just plug in zero?

Answer 29

yea but thats not it because your then left with choice A. and D.

Answer 30

why only a or d

Answer 31

because when you plug in x=0 for both of those functions you get the lowest y value of 70

Answer 32

oooh ok

Answer 33

so how do we solve it the rest of the way?

Answer 34

thinking

Answer 35

ugh wait the question says that when t=0 the temperature is 90 so the real choices are b and c

Answer 36

ok...

Answer 37

ok i think i got the answer finally and i believe it is C. because it ranges from 20-160 and its temperature at time 0 is 90

Answer 38

just let me try b first

Answer 39

ok!

Answer 40

nope its b.

Answer 41

ok! thank you so much!

Answer 42

alright glad to help

Answer 43

i hate that question though

Answer 44

You got it right!!!!

Answer 45

it killed my calculator literally it just died in my hand

Answer 46

no battery :( i cry every time

Answer 47

oh man im sorry!!! I do also... I hate trig in general!

Answer 48

:P thanks man!

Answer 49

trig is the worst glad we got it right though