1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
dybincka [34]
3 years ago
14

What is the sum of the finite arithmetic series (-5)+0+5+10+ ......+65

Mathematics
1 answer:
Alex17521 [72]3 years ago
5 0

If you want to solve this problem using formulas, there are two important formulas:

t1  =  first term  =  -5          

tn  =  nth term  =  last term  =  -5

n  =  numbr of terms

Sn  =  sum of the n terms

tn  =  t1 + (n - 1)d     --->     65  =  -5 + (n - 1)(5)

                                          65  =  -5 + 5n - 5

                                          65  =  -10 + 5n

                                          75  =  5n

                                            n  =  15

Sn  =  n(t1 + tn)/2     --->     Sn  =  15(-5 + 65)/2

                                          Sn  =  450


So ur answer rounds up to 450


Letter c

:)

hope i helped 


~Luis

You might be interested in
% of 6,000 = 4,500<br> Please help
babymother [125]

Answer:

450

Step-by-step explanation:

Solution for What is 75 percent of 600:

75 percent * 600 =

(75:100)* 600 =

(75* 600):100 =

45000:100 = 450

Now we have: 75 percent of 600 = 450

Question: What is 75 percent of 600?

Percentage solution with steps:

Step 1: Our output value is 600.

Step 2: We represent the unknown value with $x$x​.

Step 3: From step 1 above,$600=100\%$600=100%​.

Step 4: Similarly, $x=75\%$x=75%​.

Step 5: This results in a pair of simple equations:

$600=100\%(1)$600=100%(1)​.

$x=75\%(2)$x=75%(2)​.

Step 6: By dividing equation 1 by equation 2 and noting that both the RHS (right hand side) of both

equations have the same unit (%); we have

600

x​=

100%

75%​​

Step 7: Again, the reciprocal of both sides gives

x

600​=

75

100​

Therefore, $75\%$75%​ of $600$600​ is $450$

7 0
3 years ago
Ben and Landon took turns driving on the recent 820 mile road trip Ben averaged 60 mph while Landon average 56 mph if the trip t
AysviL [449]

Answer:

9 hours

Step-by-step explanation:

Let :

Landon hours = x

Ben hours = y

x + y = 14 - - (1)

60x + 56y = 820 - - - (2)

From (1)

y = 14 - x

60x + 56(14 - x) = 820

60x + 784 - 56x = 820

4x = 820 - 784

4x = 36

x = 36/4

x = 9

Landon drove for 9 hours

4 0
3 years ago
What is the average of 0.76 and 0.88
NeX [460]
The average is (0.76+0.88) / 2 = 1.64 / 2 = 0.82
3 0
3 years ago
Read 2 more answers
What is the solution to this equation 1^6 x =2
Alenkinab [10]
<h2>Greetings!</h2>

Anything to the power of 1 is still 1, because 1^{6} is simply 1 x 1 x 1 x 1 x 1 = 1 ect.

<h3>So this changes the equation to 1x = 2, which means that:</h3>

x = 2

<h2>Hope this helps!</h2>
8 0
3 years ago
Read 2 more answers
The price of an Item has been reduced by $5.09. The new sale price is $41.03. What was the original price?
Orlov [11]

Answer:

the original price was $46.12

Step-by-step explanation:

if you add 5 back to that number.

8 0
2 years ago
Other questions:
  • Help me on number problem 4 and 5 please
    9·1 answer
  • What is the degree of 6x to the second power
    13·2 answers
  • ritin has 21/5 litres of lemonade of which he distributed 13/4 litre lemonade . how much lemonade left with him
    5·1 answer
  • Write an equation of a line perpendicular to y=4x-3 that contains the point (0,7)
    14·1 answer
  • The perimeter of a square is 48 feet. What is the length of a side?
    9·1 answer
  • Shortest distance to the origin y=1/2x^2 -4
    5·1 answer
  • What is the distance between the points (-4,0) and (-7, -14) ?​
    13·1 answer
  • 0.5(70a + 12b +2)<br> anyone??
    9·2 answers
  • N Write the expression in complete factored form. х2 + бу – бх – ху Enter the correct answer.<br>​
    13·1 answer
  • I WILL MARK 5.0 AND ANYTHING YOU WANT!! NEED THIS ASAP
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!