20% of 2100 is 420
So the tax is $420
Then 2100-420= 1680
So he has $1680 left after paying the tax.
You have not provided the choices, therefore, I cannot provide you with a specific solution. However, I will explain this problem for you to understand an apply on the choices you have.
Now, the perimeter of the rectangle is the summation of lengths of its four sides.
We have:
length = 12 ft
width = 9 ft
Therefore:
perimeter = 12 + 9 + 12 + 9 = 42 ft
Or: perimeter = 2(12+9) = 2*21 = 42 ft
Or: perimeter = 2*12 + 2*9 = 24 + 18 = 42 ft
Any expression that does not lead to the above result would be wrong
Hope this helps :)
8
|| Hope this is what your looking for ^.^
Answer:
a = 3
Step-by-step explanation:
First start writing out the binomial expansion of 
![[1^7] + [7C1 * 1^6 *(ax)] + [7C2*1^5*(ax)^2]+[7C3*1^4*(ax)^3]](https://tex.z-dn.net/?f=%5B1%5E7%5D%20%2B%20%5B7C1%20%2A%201%5E6%20%2A%28ax%29%5D%20%2B%20%5B7C2%2A1%5E5%2A%28ax%29%5E2%5D%2B%5B7C3%2A1%5E4%2A%28ax%29%5E3%5D)
as you can see from this, the last bracket will produce our 
term
Hope this helps, let me know if you have any questions :)
