Answer:
s = 5 feet
Step-by-step explanation:
.................
2(420) + 2(245) = x
840 + 490 = x
x = 1330 yards
X=1, this is because you have to distribute the number 3 to each value in the parentheses and the multiply the answer by to since the equation is there twice
a) The infinite series in <em>sigma</em> notation is described by this expression:
(1)
b) The <em>explicit</em> formula for the n-th <em>partial</em> sum is represented by the following expression:
, i ∈
(2)
<h3>How to derive an expression for a monotonous series</h3>
An infinite series is <em>monotonous</em> when it is <em>bounded</em>, that is, when the limit of the <em>infinite</em> series exists. In this case, we have an evidence of monotony in the denominators of the terms of the given series. In two consecutive terms, the latter always have a denominator greater than the former.
a) The series in <em>sigma</em> notation is now described below:

b) The <em>explicit</em> formula for the n-th <em>partial</em> sum is defined by the expression within the sum, which is now presented below:
, i ∈
To learn more on infinite series: brainly.com/question/4268280
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Your answer is going to be 328.