Adisplay of cans in a grocery store consists of 15 rows. there are 45 cans on the bottom , 42 cans on the next row, and so on, how many cans did they use in the display?

n = 9

Step-by-step explanation:

20 + 18 + ... + 6 + 4

a = 20 ; d = -2 ; n = ?

4 = 20 + (n-1)(-2)

-16 = (n-1)(-2)

n-1 = 8

n = 9

S(9) = (9/2)(20+4)

S(9) = 4.5*24

S(9) = 108

goog may have it for you

answer:   28.56 feet (approx)

step-by-step explanation:

since, triangle abc has measure of angle c equal to 55 degrees, measure of angle abc equal to 90 degrees, and length of bc equal to 20 feet.

we have to find out the measurement of segment ab.

therefore, tan 55° =

but bc = 20 feet.

⇒ tan 55 ° =  

⇒ ab = 20 × tan 55 °

⇒ ab = 20 × 1.42814800674

⇒ ab = 28.5629601348   ≈ 28.56 feet