Me ! i need immediate on the 2 above

The first answer is d and second answer is a

Step-by-step explanation:

    3×n×(n+1)×(2n+1)/6 - 8×n

    Putting n = 11

    3×11×22×23/6 - 8×11

    1430

     The answer is 1430 option d

     We have to find an expression for 10 terms of the series  3/4 + 9/8 +    

     3/2...................................................

     Evaluating the the expansion we get the first option as answer by

     substituting the values of i's

     The answer is option a

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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step-by-step explanation: