Aclassroom has stadium. there are 10 seats in the first row, 13 seats in the second row, 16 seats in the third row and so on. there are 56 rows what is the seating capacity of the class?

the classroom has 4,900 seats.

the classroom has 5,180 seats.

the classroom has 4,995 seats

the classroom has 5,348 seats

B

5180

Step-by-step explanation:

a1 = 10

n = 56

d = 3

L = a1 + (n - 1)*d

L = 10 + 55*3

L = 10 + 165

L = 175

Sum = (a1 + L)*n/2

Sum = (10 + 175)*56/2

Sum = 185 * 56/2

Sum = 185 * 28

Sum = 5180

The answer is B

idk this answer sorry cant on this one.

step-by-step explanation:

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

hope it