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
olga2289 [7]
3 years ago
13

Find the sum of the first 20 terms of an arithmetic series if the first term is 10 and the twentieth term is 38.

Mathematics
1 answer:
elena-14-01-66 [18.8K]3 years ago
6 0

Answer:480

Step-by-step explanation:

To find the sum of the first n terms of an arithmetic series use the formula, n terms of an arithmetic sequence use the formula,

Sn=n(a1 + an)2

n=20

a1= 10

a20=38

20(10+38)/2

20(48)/2

960/2

480

So the ans is 480

You might be interested in
A system of equations is shown below:
PolarNik [594]
X = 8 and Y = 17 so the answer is A (8, 17)
4 0
3 years ago
Read 2 more answers
What is the proportion of 36 / x equals 8/7
Shalnov [3]

Answer:

Step-by-step explanation:

Multiply all terms by the same value to eliminate fraction denominators

36/x=8/7

x times 36/x=x times 8/7

Cancel multiplied terms that are in the denominator

cancel both x’s for you should have 36=x times 8/7

Combine multiplied terms into a single fraction

36=8x/7

Multiply all terms by the same value to eliminate fraction denominators

36=8x/7 so you multiply 7 times 36=7 times 8x/7

so you simplify so you get 252=8x

then you Divide both sides of the equation by the same term

252=8x     252/8=8x/8 so you get 63/2

so your final answer is x=63/2

I hope that I helped you have a nice day or night!

6 0
3 years ago
Algebra 2<br><br> Solve: f(x)=x^2-9
sergejj [24]
This problem is a difference of squares. So to solve this you want to factor it out so you get two numbers that multiple to -9 and add to 0. That would be -3 and 3

f(x)=(x-3)(x+3)

So your solution when you set f(x) to 0 would be -3 and 3.
7 0
3 years ago
On a coordinate plane, two parabolas open up. The solid-line parabola, labeled f of x, goes through (negative 2, 4), has a verte
k0ka [10]

Answer: i beleve it should be a

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
4/7 - -3/5 step by step pls explain​
lidiya [134]

Answer:

41/35

Step-by-step explanation:

Simplify the following:

4/7 + 3/5

Put 4/7 + 3/5 over the common denominator 35. 4/7 + 3/5 = (5×4)/35 + (7×3)/35:

(5×4)/35 + (7×3)/35

5×4 = 20:

20/35 + (7×3)/35

7×3 = 21:

20/35 + 21/35

20/35 + 21/35 = (20 + 21)/35:

(20 + 21)/35

| 2 | 1

+ | 2 | 0

| 4 | 1:

Answer: 41/35

5 0
3 years ago
Other questions:
  • A puppy has a mass of 4,500 grams and a kitten has a mass of 450,000 milligrams which statement is true about the animals
    8·1 answer
  • Please helpppppppppppppppppp
    12·1 answer
  • Suppose you are given the coordinates of the vertices of a polygon. What steps could you take to solve a problem involving the p
    6·2 answers
  • Rename the number <br> 25,600=_______?
    10·1 answer
  • two dice are rolled find the probability that the sum of the numbers appears on the upper face of dice is equal to 9​
    7·1 answer
  • Cindy typed 200 words in 5 minutes. At this rate, how many words can she type in 25 minutes?
    14·1 answer
  • (33x3+6x-9)+(-33x3+9x2-10)
    8·2 answers
  • Plsss help I’ll give u brainlest and 10 points
    12·1 answer
  • What is parallel to y=4x-1
    9·2 answers
  • Help me guys and I will help u out
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!