Answer:
21, 15
Step-by-step explanation:
12+9=21
the third side of a triangle must be equal to the two other sides added up to make it possible
also 15 if you're trying to make a possible right triangle
22 I believe. You take 1/3 and make it 2/6 and that's a 3/6 difference so 11 gallons is half the tank then just multiply 11•2=22
-3x - 3 (5x - 17) = 3
-3x - 15x + 51 = 3. combine like terms
-18 x + 51 - 51 = 3 - 51
-18x = -48 divide by -18
x = 3
put 3 in for x
-3 (3) -3y = 3 multiply
-9 +9 - 3y = 3 + 9 combine like terms
-3y = 12 divide by -3
y = -4
