The sum of the first n terms in a geometric sequence given the first term (a1) and the common ratio (r) is calculated through the equation,
<span>Sn </span>= (<span><span><span>a1</span>(1−<span>r^n</span>) / (</span><span>1−r)
Substituting the known terms,
Sn = (20)(1 - (1/4)^4)) / (1 - 1/4)
Sn = 26.5625
Thus, the sum of the first four terms is 26.5625. </span></span>
Answer:
6 gallons of gas
Step-by-step explanation:
20.00 - 2.12 = 17.88
17.88 divided by 2.98 equals 6
I'm not sure how you obtained -5 as your answer but this is the mathematical explanation. hope this helps!
Answer: 1230
Step-by-step explanation: 22 hours that's how much she will be studying in total till the seventh day
and 105 mins till the seventh day
so she will be studying 1230 in total so put 1230 at the blank
1230 is your answer