Answer:
Step-by-step explanation:
(a+b)(a-b)=a^2-b^2
Its 0.343 because it cannot be expressed as a fraction or whole number
Answer:
Step-by-step explanation:

Answer:
10
Step-by-step explanation:
We want to find k when y=kx
2y = 20x
Divide each side by 2
2y/2 =20x/2
y = 10x
The constant of proportionality is 10