Answer:
A. -11x + 7y
Step-by-step explanation:
4y - 9x + 3y - 2x
4y + 3y = 7y
-9x - 2x = -11x
-11x + 7y
I hope this helps!
Answer:

Step-by-step explanation:
The initial value of the population is 650
Each year the population increases 160
The population oscillates 19 above and below.
Due to this information you can assume that the function is:

where for t=0 p(t)=650
where t=12 160/12 (12) = 160
you can assume that the sinusoidal function has a period of one month. Thus, the population oscillates several times in one year with an amplitu of the oscillation of 19. The, w is:

Answer:
I think it is 1 ruler to measure it
Hey there!
Let's first simplify this expression using our rules of exponents.
We know that:
1)

And:
2)

Finally:
3)

One more:
4)

Now, we can simplify the top. Using our rule number 1<em />, we know we can just multiply the exponents to get 7^12. On the bottom, using our rule number 2, we know we can add out exponents to also get 7^12.
Without even simplifying the powers, we know that everything over itself if one. Therefore, in our answer choices, we're looking for everything not equal to one.
For the 7^12/7^12, we know that's what we just got so it equals one. For the 1, well, one equals one. For the next one, referring to our last rule, 4, anything to the power of 0 equals one, therefore that's also equal to one.
Now for our final answer choice. If we take another look at rule number 3, we know we have to subtract the exponent at the bottom from the one at the top because the exponents have the same base. That gives us 7^-24, and that surely does not equal one.
Therefore, your answer is:

Hope this helps!