Answer:
I think it is -4 and -3
Step-by-step explanation:
3.5x=42
x represents the length, since the formula to find area of a rectangle is width times length.
D=y2-y1
D+y1= y2-y1+y1 add y1 to both sides to cancel it out.
D+y1=y2 that drops -y1 for the right side but the left remains.
And that's your answer.
16 the answer is 16
7 is 5more than to see 2 plus 5 = 7 so 21 - 5 =16 GENIUS :3