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ololo11 [35]
3 years ago
9

Mops

Mathematics
1 answer:
Ipatiy [6.2K]3 years ago
7 0

Answer:

270

Step-by-step explanation:

For any arithmetic sequence

nth term is given by

nth term = a + (n-1)d

where a is first term,

d is common difference

d is given by nth term - (n-1)th term

sum of n terms given by

sum = n/2(2a + (n-1)d)

________________________________________________

Given arithmetic sequence

-2,0,2,4,6,8...

first term a = -2

lets take third term as nth term and second term as (n-1)th term to find common difference d.

d = 2 - 0 = 2

using a = -2 , d = 2, n = 18

thus, sum of first 18 terms = n/2(2a + (n-1)d)

                                           =18/2( 2*(-2) + (18-1) 2)

                                           =9 ( -4 + 34)

                                           =9 ( 30) = 270

Thus, sum of first 18 terms is 270.

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N/8 = 11/5 what is n?
Reika [66]

Answer:

n = 88/5

Step-by-step explanation:

Clear out the fractions by multiplying both sides by 8:

n = 88/5

3 0
3 years ago
The equation is ax+r=7 <br><br>how do I solve for r??
Strike441 [17]
The solution is r= 7/a-x How did i do this?
Your equation is ax+ r=7, so the goal is to isolate the r. You begin by dividing the a from the ax. Remember, what you do to one side, you must do to the other. So you do 7/a, since you can't simplify 7/a, leave it as it is. Next, your equation should look like this x+r=7/a. In order to isolate the r, you move the x to the other side by subtracting, which leaves you with the answer of r= 7/a-x.
Hope this helped!
7 0
3 years ago
Read 2 more answers
What is the correct answer?
slamgirl [31]

Answer:

The answer Is C because after further review I have realized C is the best answer choice

3 0
3 years ago
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(15y^0 x^-3 z^2/ 3x^3 y^7 z^1/2)^2
ArbitrLikvidat [17]
Hello! For this you are just going to do this step by step, and remember to use PEMDAS. That is the order in which you should do the math. The abbreviation stands for  Parenthesis, exponents, multiplication, division, addition and subtraction. So lets get started!
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Hope this helps!! If you need any more help or further explanation just let me know!! :)
 

6 0
4 years ago
Find the value of x that makes the quadrilateral a parallelogram.<br> 3x + 5<br> 5x - 9<br> X =
Lady bird [3.3K]

Answer:

3x+5=5x-9(llgram oppositesides are equal)

3x-5x= -9-5

-2x=-14

x= -14/-2

x=7

4 0
2 years ago
Read 2 more answers
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