Answer:
x = 5
Step-by-step explanation:
Given that,

Cross multiplying both sides,

Taking like terms together,

So, the value of x is equal to 5.
Answer:
Neither; see below
Step-by-step explanation:
Your acceleration: 
Your friend's acceleration: 
Therefore, since both you and your friend accelerate at the same rate, neither is faster.
Um, I don't know if I actually answered the question, but I think that the second one is cheaper to rent.
Recognize that you must combine "like" terms. 5x^2y and x^2y are "like" terms.
Adding them together, you get 6x^2y.
Now add 2xy^2 to 6x^2y. These are NOT "like" terms, so you end up with
6x^2y+2xy^2 as your final answer. This answer is acceptable as is.
However, you could factor out the common factors: 2xy(3x+y).