A question about summation notation in series. Could someone explain why the answers in the attached image are correct? For the left question, the top two choices seem to be the exact same thing, so I do not understand why one is correct while the other is not. For the right question, why is the answer (4n+4)? When the bottom limit is the 0th term, I thought you were supposed to replace the n in the equation with (n-1), which would make it (4n-4).

Find the amount in a continuously compounded account for the given condition. principal: $1000, annual interest rate: 4.8%, time: 2 yr

On new year's day, the average temperature of a city is 5.7 degrees celsius. but for new year's day 2012, the temperature was 9.8 degrees below the average. i) if a represents the average temperature on new year's day and 7 represents the temperature on new year's day 2012, what formula accurately relates the two values together? ii) what was the temperature on new year's day 2012? dt a 0.8 ii) - 4 1 degrees celsius da-t-98 ii) 59 degrees celsius 1) 7 = -9,8 11) 59 degrees celsius ii) l degrees celsius

Multiply and simplify. 2x^2 y^3 z^2 · 4xy^4 x^2 i will mark you brainliest if right. show how you got the answer, !