4. A concert hall has its seats arranged so that each row has thirty more seats than the row in front of it. a) If the hall has 20 rows and the third row has 120 seats how many seats are in the last row?

b) How many seats are there altogether?

Please help me. I can't figure out how to solve this properly.​

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

69.64%

step-by-step explanation:

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noun

the practice of taking someone else's work or ideas and passing them off as one's own.

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