Answer:
Step-by-step explanation:
x²- y² = (x+y) (x-y)
x² + xy = x(x+y)
x² + 2xy + y² = (x+y) (x+y)
Step-by-step explanation:
-9+15=6, -6+15=9
So,
6 < 9
Answer:
They are proportional
Step-by-step explanation:
Cross multiply, if the results are the same, they are proportional. If not, well then they're not proportional.
25 × 27 = 675
45 × 15 = 675
They have the same result
They are proportional
Respuesta:
Botella, B = 0.5
Jarra, C = 2,5
Explicación paso a paso:
Dejar :
Garrafa = C
Botella = B
C = 5B - - - - 1)
3 garrafas más 7 botellas = 11 litros
3C + 7B = 11
C = 5B
3 (5B) + 7B = 11
15B + 7B = 11
22B = 11
B = 11/22
B = 1/2 = 0,5
Sustituyendo B = 0.5 en 1)
C = 5B
C = 5 (0,5)
C = 2,5