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Gnoma [55]
3 years ago
15

Super Duper Urgent! Find the sum of the summation of 2 i minus 12, from i equals 7 to 16.

Mathematics
2 answers:
Nadya [2.5K]3 years ago
7 0
Sigma(i = 7 to 16, 2i-12) = 2*sigma(i = 7 to 16, i) -120
= 2*115-120 = 110
Sergio [31]3 years ago
6 0

The correct answer is 110

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Ninety six passengers rode a train. Tickets for regular coach seats are $114. Tickets for sleeper car seats are $295. The receip
MrRa [10]
C = amount of folks buying coach tickets
s = amount fo folks buying sleeper car tickets

we know the train had a total of 96 passengers, so, whatever "c" and "s" are
c + s = 96

we know all tickets sold for all 96 passengers was 19994, so, if "c" folks rode coach, each ticket is 114, thus 114*c is  how much money was from couch, or 114c

if "s" folks rode the sleeper car, we know each ticket is 295 each, so 295*s is how much money was from the sleeper car

we also know, the total for all tickets is 19994

thus    114c + 295s = 19994

thus   \bf \begin{cases}
c+s=96\implies \boxed{s}=96-c\\
114c+295s = 19994\\
----------\\
114c+295\left( \boxed{96-c} \right)=19994
\end{cases}

solve for "s", to see how many folks rode coach

what about the sleeper car? well, s = 96 - c
5 0
3 years ago
Determine the sign of the sum of 14+30.<br> A) positive<br> B) negative<br> C) zero
enyata [817]
The correct answer is a 14+30= 44. And 44 is positive
5 0
3 years ago
Read 2 more answers
What is the measure of n?<br> 28<br> n = [?]<br> n<br> 7<br> 3
qwelly [4]

Answer: 14

Step-by-step explanation:

By the geometric mean theorem,

\frac{n}{28}=\frac{7}{n}\\\\n^{2}=196\\\\n=\boxed{14}

3 0
2 years ago
For the right triangle shown, which expression represents the length of CB?
Rudik [331]

Answer:

B) 6 tan(35°)

Step-by-step explanation:

from the right angle tan° = opposite / adjacent

therefore tan (35°) = (x) / 6

by multiplying 6 to both sides

tan (35°)  * 6 = (x) / 6 * 6

therefore (x) = 6 tan (35°)

5 0
3 years ago
Write 3/16 as a decimal
ElenaW [278]

Answer:

0.1875

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
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