Answer:
a) 320 is correct
b) 20 more 18 year old students
Step-by-step explanation:
b) 20 more 18 year old students: The only information we have in the 25 - 35 minute time frame is the data for 30 minutes:
12 years: 40 students
18 years: 60 students
Difference = 20 more 18 year old students than 12 year old students spent spent time on social media for 25 - 35 seconds.
reverse x and y
x=3y+4
y=(x-4)/3
What u need
The equation of a circle:
(h, k) - center
r - radius
We have the center (5, -3) and the radius r = 9.
Substitute:
Use
c. How much money would be in the account after 18 years?