Answer: there are 580 seats
Step-by-step explanation:
The number of seats in each row is increasing in arithmetic progression.
The formula for determining the sum of n terms of an arithmetic sequence is expressed as
Sn = n/2[(2a + (n - 1)d]
Where
a represents the first term of the sequence.
d represents the common difference.
n represents the number of terms in the sequence.
From the information given,
a = 10 seats
d = 2 seats (the seats in each row are increasing by 2)
n = 20(number of rows)
We want to determine the number of seats in 20 rows. Therefore
S20 = 20/2[(2×10 + (20 - 1)2]
S20 = 10(20 + 38) = 10×58
S = 580
Answer: c
Step-by-step explanation:
Answer:
option 3
$46.02
Step-by-step explanation:
First we have to look at the value of the French francs with respect to the dollars, we will look at the option of Wednesday which is how the problem asks.
if we see in the table it tells us that every 1 french franc gives us 0.2301 dollars
Now if we have 200 French francs, how many dollars will they give us?
1 = 0.2301
200 = ?
200 * 0.2301 / 1 =
46.02
You have 342 days left of school.
365 - 23 = 342
Answer: 
Step-by-step explanation:
The equation for inverse variation is:
Where "k" is the constant of variation.
If you solve for for the constant "k", you get the form:
So, if 
then 
Knowing the value of "k", you can find the value of "x" when 
, by substituting these values into the equation .
Therefore, you get that the value of "x" when is:
