First of all, the minus sign before the parenthesis changes the sign of all the terms inside:

Now, we can sum like terms:

So, the final expression is

Answer:
The railroad company have to sell 94 tickets to meet its goal.
Answer:
58 minutes
Step-by-step explanation:
s = 170 - 64 - 48
s = 58
The nth term of any geometric sequence can be expressed as:
a(n)=ar^(n-1), a(n)=nth term, a=initial term, r=common ratio, n=term number...
We can easily see that the first term, a=-8
The common ratio is 4/-8=-2/4=1/-2=r=-1/2 so the rule is:
a(n)=-8(-1/2)^(n-1) so the tenth term is:
a(10)=-8(-1/2)^(10-1)
a(10)=-8(-1/2)^9
a(10)=1/64