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Answer:
225
Discussion:
Sum ( 2n - 1) from n = 1 to 15
= Sum(2n) - Sum(1) from n = 1 to 15
= 2 Sum(n) - Sum(1) from n = 1 to 15
= 2* 15(15+1)/2 - (1 + 1 + .. + 1)
The first value comes from the fact that the sum of the first n integers is n(n+1)/2. The latter value sums 15 1's.
= 2 * 15 * 16/2 - 15 => 2/2 = 1
= 15*16 - 15 => 15*16 = 240
= 240 - 15
= 225
Thank you,
MrB
Answer:
c
Step-by-step explanation:
Regal theater sold 321 adult tickets and 227 children tickets.
Step-by-step explanation:
Given,
Cost of each adult ticket = $6.50
Cost of each child's ticket = $3.50
Total tickets sold = 548
Total worth of sold tickets = $2881
Let,
x represent the number of adult tickets sold
y represent the number of child tickets sold
According to given statement;
x+y=548 Eqn 1
6.50x+3.50y=2881 Eqn 2
Multiplying Eqn 1 by 6.50

Subtracting Eqn 2 from Eqn 3

Dividing both sides by 3

Putting y=227 in Eqn 1

Regal theater sold 321 adult tickets and 227 children tickets.
Keywords: linear equation, elimination method
Learn more about elimination method at:
#LearnwithBrainly
Answer:
Sam would receive 17 boxes of books.
Step-by-step explanation:
Given:
Books ordered by Sam this week is given as:
120 books on Monday
286 books on Wednesday
To find the number of boxes Sam received if there are 24 books in each box.
Solution:
Total books ordered by Sam this week = 
The total number of books is packed in boxes of 24 books each and received by Sam.
Thus, total number of books must be divided by 24 to find the number of boxed Sam would receive on Friday.
Total number of boxes of Books received by Sam =
Thus, Sam would receive 17 boxes of books.
-3
Because when u plug in x-value(0) in the graph the y=-3