When the piggy bank was opened, it yielded $4.05 in nickels and pennies. If there were 157 nickels and pennies altogether, how many of each were there in the bank? [Instructions: Indicate pennies using P and nickels using N. Example: N=1, P=2]

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

read more on -

step-by-step explanation: