Question

Help please is this D?

Answer 1

let's put the individual pieces of information together

- 0 at 0 means it crosses (0,0) would this be a cos or a sin function?
- amplitude of 5, what does that mean in terms of how the function is written?
- period of 4 seconds, remember what we said earlier about period = 2pi/b, calculate b which becomes the coefficient of t

lmk if you get stuck

Answer 2

A

Answer 3

oh wait you were right the first time, it's D

Answer 4

Litte confused, my best guess is B? :/

Answer 5

well if it crosses (0,4) it's probably not a sin function since sine typically crosses (0,0)

try to calculate the b value by taking period = 2pi/b

Answer 6

the period is stated to be 6 so

6 = 2pi/b solve for b

Answer 7

pi/3

Answer 8

good so putting everything together, amplitude of 4, b = pi/3, a cos function gives us

4cos(t*pi/3) = answer A

Answer 9

8

Answer 10

good

Answer 11

pi/3

Answer 12

not quite, pi/3 is the b value

first find the period based on that b-value

period = 2pi/b

then after that, find frequency = 1/period

Answer 13

1/2pi

Answer 14

period = 2pi/b = 2pi/(pi/3) = ?

Answer 15

2/4

Answer 16

2/3**

Answer 17

remember the rule for dividing fractions, flip the numerator and denominator of the second fraction, then multiply

2pi/(pi/3) = 2pi * (3/pi) = ?

Answer 18

6

Answer 19

awesome, so if period = 6 then frequency = 1/6 = your answer

Answer 20

you are given L and g, find T

Answer 21

4.49

Answer 22

well done