Question

I count on in equal steps. My first number is -9, my fifth number is 7?What is my third number?​

Answer 1

Answer:

let n be d number of steps

and x be the origin of the sequence

x+n=-9

x+5n=7

-4n=-16

n=-16/-4=4

x+n=-9

x+4=-9

x=-9-4

x=-13

for third third number

x+3n

-13+3(4)

-13+12=-1

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