Answer:
The speed of the periodic wave is 3 meters per second.
Step-by-step explanation:
Given that:
Wavelength of the periodic wave = 1 m
Frequency of the periodic wave = 3 Hz
We have to find the speed of the wave.
Speed of wave = Wavelength * Frequency of wave
Speed = fλ
Speed = 1*3
Speed = 3 m/s
Hence,
The speed of the periodic wave is 3 meters per second.
Given:
The ratio of boys to girls is
.
Number of boys = 24
To find:
The number of girls.
Solution:
We have,
Boys: Girls = 4:5
Let the number of boys be 4x and number of girls be 5x.



Now,
Number of girls = 
= 
= 
Therefore, the number of girls is 30.
B.
Since he had to subtract 7 to get to -3, you would have to find the expression that would yield that answer.
Hope this helps!
If they are equilateral triangles, then yes; however, if they are not, it is impossible to tell without a diagram.