Answer:
the exact expression as there are 2 different variables in multiplication
not b, as sound cant travel in a vacuum (like outer space)
Answer:

Explanation:
Let the length of the rectangle be
units.
We were given that the length is <em>3 less than twice the width.</em>
This implies that: 
We have that the area of this rectangle is 50 square inches.
Recall that area of rectangle is given by:


Therefore the required equation is 
Answer:
a longer wavelength means a lower frequency, and a shorter wavelength means a higher frequency!