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
Ksenya-84 [330]
3 years ago
6

I need help with this

Mathematics
1 answer:
lilavasa [31]3 years ago
6 0

This symbol means that you have to evaluate the generic term -4n+1 at n=1,2,3,4,5, and then sum all the terms. Here's the table:

\begin{array}{c|c}n&-4n+1\\1&-3\\2&-7\\3&-11\\4&-15\\5&-19\end{array}

So, their sum is

-3-7-11-15-19=-55

Alternatively, you manipulate the expression to get

\displaystyle \sum_{n=1}^5(-4n+1) = \sum_{n=1}^5(-4n) + \sum_{n=1}^5 1 = -4\sum_{n=1}^5 n + \sum_{n=1}^5 1

For the first sum you can use the formula

\displaystyle \sum_{n=1}^k n = \dfrac{k(k+1)}{2} \implies \sum_{n=1}^5 n = \dfrac{5\cdot 6}{2} = 15

The second sum is simply 1 summed 5 times with itself: 1+1+1+1+1=5.

So, we have

-4\cdot 15 + 5 = -60+5 = -55

You might be interested in
What is the value of x then find the messures of Angles M and N​
AveGali [126]

Answer:

x=32

Step-by-step explanation:

sum of interior angles of a triangle = 180

add up all angles and equate to 180

(4x-13)+(x+18)+15=180

5x=160

x=160/5=32

x+18  =   32+18    = 50

4x-13  =  4x32-13 = 128-13 = 115

add up all to check whether ans = 180;  15+50+115=180

3 0
3 years ago
Read 2 more answers
HEEEEEEEEEEEEEEEEEEEEEELP 10 POINTS math vocab 2 questions
sergij07 [2.7K]

Answer:

Number 1: Evaluate (A)

Number 2: Operator (B)


6 0
3 years ago
Directions: Simplify the following expressions using the imaginary number.
drek231 [11]

Answer:

1  i(sqrt5)

2  7i

3  -9i

4  -64i

5  -5i(sqrt2)

6  -4i(sqrt3)

7  10i(sqrt3)

8  2i(sqrt2)

9  3i(sqrt7)

10  -30i(sqrt2)

Step-by-step explanation:

i is the square root of (-1). We can simplify each one as such.

5 0
1 year ago
Geometry grade 10 how do we see the adjecent side ​
RideAnS [48]

Answer: These sides are labeled in relation to an angle. The opposite side is across from a given angle. The adjacent side is the non-hypotenuse side that is next to a given angle.

Step-by-step explanation:

8 0
1 year ago
Help with inequality
Alona [7]

Answer:

1. x>20   2. x≤1     3.x<4     4.x>9      5.x≥-13

6 0
3 years ago
Other questions:
  • Malik's arts and crafts shop has a bolt of crimson velvet 32 meters long. A customer came in during the morning and bought 120 c
    8·1 answer
  • 3x+2 = 6x-13 what is x
    15·2 answers
  • (a) How many different three-letter initials can people have: , (b) How many different three-letter initials with none of the le
    7·1 answer
  • Could somebody please help
    5·1 answer
  • Help me help me help me help me
    14·1 answer
  • Use the vertex formula to find the vertex of the quadratic function ​f(x)=-x^2+2-5.
    7·1 answer
  • How is an equation different from an inequality
    10·2 answers
  • How are you all my friends?​
    14·2 answers
  • Can you help me?
    8·2 answers
  • Rachel bought 1,500 shares of Cawh Consolidated Bank at a price of $24. 85 each. As the price climbed, she sold off parts of her
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!