11. The frequency of a musical note, measured in hertz (Hz), is called its pitch. The pitches of the A keys
on a piano change exponentially, as shown.
A,
A,
55 H7
A2
110 Hz
A4
440 Hz
220 Hz
What is the frequency of Az?
(A) 880 Hz
(C) 3520 Hz
(B)
(D)
1760 Hz
7040 Hz

answer: -2+√x,-2-√x

i hope this , i don't know if you're looking for a pair or not.

54 km / hours

step-by-step explanation:

we need to convert seconds to hours

60 seconds = 1 minutes

60 minutes = 1hour

15 m         60 second   60 minutes

  * *         = 54000 meters/ hour

second     1 minute             1 hour

now we need to convert meters to km

1000 m = 1 km

54000 m       1 km

*   = 54 km / hours

hour               1000m

a=24; b=12

step-by-step explanation:

a/b=2: 1

a=2b

36/(1+2)=12

b=12

a=24