Answer:
23x+10y
Step-by-step explanation:
add all x variables and all y variables together
73 + 55 = 52 + n
Subtract 52 from each side:
73 + 3 = n
n = 76
Answer:

Estimated
Step-by-step explanation:
Answer:
third option
Step-by-step explanation:
Ahh yes, negative exponents always give us a scare once and a while. All the negative means is to flip the position of its base. For instance, if x has a negative exponent and x in the denominator, all you would have to do is move x to the numerator with the same power (except it's no longer negative). Before we substitute x and all the other variables which the values given, let's eliminate the negatives first.
After flipping positions/eliminating the negative exponents it should look like this:

which simplifies to

now that everything is simplified, and all negative exponents are eliminated we can substitute x with 2, and y with (-4).

which simplifies to

Final Answer: - \frac{1}{32} [/tex]