brianna5626
29.07.2019 •
Mathematics
What is the first term of the geometric sequence presented in the table below? n 3 8 an 112 −3,584 hint: an = a1(r)n − 1, where a1 is the first term and r is the common ratio. a1 = −28 a1 = −2 a1 = -1/2 a1 = 28
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Ответ:
A3 = 112,
A8 = - 3,584
An = A1 *r ^ (n-1)
=> A3 = A1 (r^2) = 112
A8 = A1(r^7) = - 3,584
=> - 3584 / 112 = (r^7) / (r^2)
=> (r^5) = - 32
=> r = - 2
=> A1 (- 2)^2 = 112
=> A1 = 112 / 4 = 28
a1 = 28
Ответ:
67 inches
Step-by-step explanation:
Since the question is asking how many inches total do you have, we need to add up the 2 values given:
39 inches + 28 inches = 67 inches.
We can convert this to feet by dividing by 12:
67 in /12 in/ft ≈ a little over 5 and a half feet