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
Darina [25.2K]
4 years ago
10

3.

Mathematics
2 answers:
zheka24 [161]4 years ago
6 0

Answer:

20

Step-by-step explanation:

Sn = (n/2)(a1 + a1 + d(n-1)), where S = sum, a1 = first term, n = number of terms, d = common difference

 

400 = (n/2)(1 + 1 + 2(n - 1))

400 = (n/2)(2  + 2n - 2)

400 = (n/2)(2n

400 = n2

20 = n

 

Twenty numbers are in the set.

Lesechka [4]4 years ago
3 0

Answer:

Step-by-step explanation:

You might be interested in
Jaidee paid $2 for a fruit drink. She now has $19. With how much money did she start?
forsale [732]

Answer:

$21

Step-by-step explanation:

Add what she spent to what she has left.

7 0
3 years ago
Read 2 more answers
The vertices of a triangle are (-1.3) (-5,3) (-5,7) how would you reflect the triangle in the x-axis and in the y-axis ? Give th
grandymaker [24]
Simple way to see it is to multiply the value opposite of the axis you're flipping it over by -1. For example the point (-5,7) would become (5,7) when reflected over the y-axis, because the point is moving from the left to the right. This means the triangle would be (1,3) (5,3) and (5,7) when reflected over the y-axis. For reflection over the x-axis it would be (-1,-3) (-5,-3) and (-5,-7) because each point is moving down.
8 0
4 years ago
Simplify the difference (-7×-5×^4+5)-(-7×^4-5-9×)
padilas [110]
-7x-5v^4+5+7x^4+5+9x-=
2x^4+2x+10
6 0
4 years ago
52= -5x -3 can you solve for x
Roman55 [17]

Answer:

x = -11

Step-by-step explanation:

First, add three to both sides on the equation. Then, your equation becomes 55= -5x. Finally, divide both sides by -5 to get -11 = x. So, x equals -11. Hope this helps!

4 0
4 years ago
Read 2 more answers
Determine the slope of the graph of the linear<br> equation y = -3/7x + 5.
Mashutka [201]
The -3/7 would be slope because it is also the one with the x
5 0
3 years ago
Other questions:
  • What is nine divided by five to the sixth power?
    12·2 answers
  • Solve for x 2X equals four ninth
    10·2 answers
  • O
    7·1 answer
  • What is the product?<br> (2x-1)(x+4)<br> 2x²-4<br> 0<br> 2x²+4<br> 0<br> 2x² + 7x-4<br> 2x² – 7x-4
    7·2 answers
  • How do you write 52 as a power of 6
    8·2 answers
  • Janice had litre of cooking oil. She used tof it for frying wedges for a party. What
    11·2 answers
  • Which number is not in the mean median or mode of the data set for 3 15 11 3 8 7 5​
    5·1 answer
  • Winner-brainliest <br> Tell me the answer in rows<br> Pasta 1.<br> 2 and so on
    15·2 answers
  • How many terms does the expression have? -7+4-3x+8x−7+4−3x+8x
    7·1 answer
  • Express cos k as a fraction in simplest terms.
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!