Answer:
x is form
Step-by-step explanation:
Step-by-step explanation:
that is
sum(2^r) for r=1 to n, plus sum(1/2) for r=1 to n.
and that is
sum(2^r) + n/2 for r=1 to n.
2^r is a geometric sequence with 2 being the common ratio (every new term is created by multiplying the previous term by 2).
and since r is starting at 1, the first term a1 = 2.
the formula for the sum of a finite geometric sequence is
Sn = a1×(1 - r^n) / (1 - r)
with r being the common ratio .
so, in our case
Sn = 2×(1 - 2^n) / (1 - 2)
Sn = (2 - 2^(n+1)) / -1 = 2^(n+1) - 2
and so, in total we get
2^(n+1) - 2 + n/2 = 2^(n+1) + (n - 4)/2
X+2 or x+2=y. X would be Luke’s age and if you add 2 years you would get Ellen’s age (y). Hope this helps.
Answer:
it is A bacause the fractions for that one are correct
Step-by-step explanation:
Answer:
one hundred sixty million, twenty-nine thousand eight hundred thirty, thirty-five hundred thousandths
Step-by-step explanation:
Each of the numbers written in word form instead of standard form. Hope it helps!
