I ordered some books online for myself and friends.
Each book costs $13 and the store charges a flat rate for shipping of $20.
Write an expression for the cost of buying n books.

13n+20

Step-by-step explanation:

If 20 is the flat rate, then you dont put x to it. X is how many books you are going to get and 13 is how much you have to pay for each book. If that makes sense.

Brainliest?

The expression will be the price per book times the amount of books, n, plus the shipping rate.

13n + 20

I hope this helps :)

the barter

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