15:3 is the only equivalent ratio to 20:4.
1) domain: x cannot be -1/3, 0
2) domain: m cannot be 4/3, -7/2
3) domain: m cannot be 3
i thimk is two number wich is
c 9.8
d 12 cm
yoou
are
add
them
up
So firstly, factor out h on the left side: 
Next, divide both sides by h: 
Lastly, subtract both sides by b and your answer will be 