Check the picture below.
neverminding for a few seconds the volume of the cylinder, the percentage in the height used by the water will be the same as the percentage of its volume. We know the total amount or 100% of the height is 14, so what is 11 in percentage?

76.002 i think honestly don’t know but have it a try
Answer:
(1)
Multiplying by 3 both sides of the equality you get that

3u is in the Span of the vectors
.
(2)
That's not true, consider the following counter example.

is a linear combination of
but is NOT a linear combination of 
Step-by-step explanation:
(1)
As the hint indicates, you know that

Then, if you multiply both sides of the equality by 3, you get that

And that's it. 3u is in the Span of the vectors 
(2)
That's not true, consider the following counter example.

is a linear combination of
but is NOT a linear combination of 
G(x)=1.58In(-)+7 is actually not the same is different but is the same because the have the x and the -