selene29
27.04.2021 •
Mathematics
A.
8. Sarah has a garden that is 4 feet by 3 feet. What is the perimeter of Sarah's garden?
16 feet
b. 7 feet
c. 14 feet
d. 9 feet
Solved
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Ответ:
Ответ:
67 seats
Step-by-step explanation:
Number of seats in row 2= 28
Number if seats in row 5 =37
This is a form of arithmetic progression.
Subtract the 2nd term from the 5th term. This will be:
a+4d= 37
-a+d = 28
3d= 9
d= 9/3
d= 3
Common difference is 3
Since d= 3, a will be
a+d = 28
a+3= 28
a= 28-3 = 25
Number of seats in row 15 will be:
a+14d
= 25+(14×3)
= 25 + 42
= 67
Row 15 has 67 seats