\[\sum_{n=1}^{7} 2(-2)^{n-1}\]
This is some simple Algebra
So it's 4x+16=-2
We subtract 16 from both sides
4x=-18
Sivide both sides by 4
X=-4.5
If you need more of an explanation I am happy to elaborate
Answer:
25
Step-by-step explanation:
144/60 = 2.4
60/2.4 = x
x = 25
10% of all the cars is 20 limos.
20 * 10 = 200 cars total.
limos + vans + sedans = total cars
200 cars total - 20 limos - 60 vans = x sedans
x = 120 sedans
