I REALLY NEED HELP WITH THIS!! Please

1. Calculate the acceleration of thus object from t=4~9 seconds

A. 19m/s^2
B. 6m/s^2
C. 3m/s^2
D. 0m/s^2

2. What is the objects acceleration at t=10 seconds?

A. 0m/s^2
B. 6m/s^2
C. -6m/s^2
D. Impossible to calculate

3. When did this object changed directions?

A. It did not change direction
B. At t= 6 seconds
C. At t= 11 seconds and At t= 14 seconds
D. At t= 4 seconds

hello,

b) 62.47% of the students are between 14 and 18 years old.

step-by-step explanation:

mean = 15 and standard deviation = 2

student between 14 to 18

formula used z-score

for age 14 , z score

using z-table , p(z> -0.5)=0.3085

for age 18 , z score

using z-table , p(z< 1.5)=0.9332

p(-0.5< z< 1.5)=0.9332-0.3085 = 0.6247

thus, 62.47% of the students are between 14 and 18 years old.

click to let others know, how is it

0.0

0 votes

1

report

read more on -

step-by-step explanation:

5

10

15

20

25

30

35

40

45

50

55

jgfjttgbgcfbc

step-by-step explanation:

h56

j

jgh

j

gh

hnh

vnf

choose (5, 1.5) and (-1.5,-3.5)

step-by-step explanation:

5 - 1.5 =3.5

-1.5 - (-3.5) = 2

3.5 + 2 =5.5

hope this !