Hello :
<span>the nth term of a geometric sequence is :
Un = Up ×r^(n-p) . r is the common ratio
for : p=5 and n= 2
U5 = U2 ×r^3
16 = -2 r^3
r^3 = -8
but : -8 = (-2)^3
so : r = -2
Un = U2 × r^(n-2)
Un = -2 ×(-2)^(n-2)= (-2)^(n-2+1)
</span><span>the nth term of a geometric sequenceis : Un = (-2)^(n-1)</span>
Answer:
-0.5
Step-by-step explanation:
Answer:
C
Step-by-step explanation:
Your numbers are stated in terms of miles. Greenville is a total of 120 miles from Rick. He drives x number of miles and sees that there is still 20 miles to go, so at the end of the driving, he has driven the unknown number of miles, x plus the 20 to get where he's going. That expression is x + 20. We set that equal to the total number of miles he has to drive and we get the expression for the trip to be x + 20 = 120, option C.