There 400 students in sixth grade of these students 180 are boys what percent of sixth graders are girls. a)30%b)45%c)55%d)not here

To solve this, you need to subtract 180 from 400:  (400-180=220).  After that (I used the fraction/proportion/variable way, but there are others), so 220/400=%(p)/100.  Multiply diaganolly, so 400*p=400p, which is equal to 220*100=22000.  Therefore, 400p=22000.  Now, you have to isolate the variable by dividing both sides by 400: 400p/400=p, and 22000/400=55.  Therefore, p=55, or %=55, so the answer is 55%, or C.

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: