Help! Will give out brainliest

aₙ = 63 * (1/3)ⁿ

Step-by-step explanation:

In the sequence 63, 21, 7,... each term is divided by 3 to get the next term

Therefore, this is a geometric series where r (the common ratio) is 1/3.

The first term in the series is 63, so that is our a₀.

The general form for a geometric series is a₀ * rⁿ

Therefore, the formula for aₙ is

aₙ = 63 * (1/3)ⁿ

I hope this helps!

5=812a+9+3

step 1: simplify both sides of the equation.

5=812a+9+3

5=(812a)+(9+3)(combine like terms)

5=812a+12

5=812a+12

step 2: flip the equation.

812a+12=5

step 3: subtract 12 from both sides.

812a+12−12=5−12

812a=−7

step 4: divide both sides by 812.

812a /812 = -7/812

a= -1/116

so the answer is

a=   -1/116

it is 28 degrees colder in detroit than philadelphia.

step-by-step explanation:

what number adds to 21

-7 + ? = 21

-7 + 28 = 21

hope it