Answer: True
Step-by-step explanation:
This is true because the sample are randomly selected. When we say "random" it means selection is being made fairly without taking into consideration any factors such as age, sex, religion, etc. The selection is not bias in that regard as such the population has the same chance of being selected.
X = number of lessons, y = total cost
y = 15x + 20 <== ur equation
when total bill was 125...y = 125
125 = 15x + 20
125 - 20 = 15x
105 = 15x
105/15 = x
7 = x <=== if Bill took 7 lessons, it would cost 125 <==
SA=4pir^2
r=20m
SA=4pi20^2
SA=4pi400
SA=1600pi m^2
2/3 is greater because 3/8 is less than 1/2 while 2/3 is greater than 1/2