On a piano, the formula to determine the frequency f of any pitch relative to the a above middle c (a440) is given by the expression f(x)=440(2)x/12, where x represents the the number of half-steps above or below a440. which of the following is equivalent to f(x)?

The answer is C. Just took the quiz and B was wrong. It needs to be the one with the smaller 12.

The answer is C on edge

Step-by-step explanation:

percentage - 25%

probability - 0.25

we know,

total amount of students in class = 20

total boys = 10

total girls = 10

no of girls who wear glasses = 10/2 = 5

probability of choosing a girl with glasses is =

number of girls wearing glasses/total number of students in the class = 5/20

thus, percentage of selecting a girl wearing glasses will be

= 5/20 × 100

= 5 × 5

25%

therefore,

probability will be 0.25

happy to

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step-by-step :