Find the midpoint between the two points. M(7x - 10 , 6y + 4), N(3x + 8 , 6y - 8) (10x - 2 , 12y - 4)

(4x - 18 , 6y -12)

(5x - 1 , 6y - 2)

(21x - 80 , 36y - 32)

answer: all of the odd numbers were opened

the first person was the one that was opening all of the lockers. since one is odd, this causes all of the odd number lockers to be opened in the end.

first, we define the variables:

x: number of years after 1950

f (x): amount of vinyl sold.

then, with the variables defined, we have:

68594 vinyl records were sold in 1958 > f (8) = 68594

91299 vinyl records were sold in 1961 > f (11) = 91299

38720 vinyl records were sold in 1952 > f (2) = 38720

161743 vinyl records were sold in 1967 > f (17) = 161743

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