X will be the speed of species b and 4x will be the speed of species a:
x + 4x = 180
5x = 180
x = 180 / 5
x = 36 m/h
If species b has a speed of 36 m/h, the speed of species a is 4 times that:
4 x 36 = 144 m/h.
Answer:

Hope it helped,
Happy homework/ study/ exam!
Sorry my links aren't working I don't know why
<span>3x(x^2+4)
= 3x^3 + 12x
hope it helps</span>
13 units....................YES
Answer:
the answer is 45 . so circle 4