15 Which represents the explicit formula for the arithmetic sequence an = 7 - 3(n − 1) in function form?
A f(n) = 3n - 10
B f(n) = 3n - 6
f(n) = -3n + 10
D f(n) = -3n - 6

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

you have to put the graph on here with the question

step-by-step explanation:

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plz mark brainliest