Answer:
x=15 in.
Step-by-step explanation:
If the parallelograms are equal (I assume they are), then the ratios are the same. 12 is 3/4 of 16. 3/4 of 20 is 15.
<em><u>should be G : y=2x+1</u></em>
Factor by grouping
( 2 x + 5 ) ( x + 4 )