The plane's airspeed is 140:)
Y-4X =3 ; 2x-3y=21
Y= 3+ 4x
2x -3( 3+4x)= 21
2x- 9- 12x= 21
-10x -9= 21
-10x -9+9= 21+9
-10x = 30
X= 30/-10= -3
Y= 3+4x = 3+ 4* (-3)= 3-12= -9
Greatest =9998
Smallest=8889
Thanks!
Answer:
B. 13
Explanation:

Logarithm rules:

Breakdown of the expression:



insert given values

