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
Kruka [31]
2 years ago
10

Given the sum s20= 910 of an arithmetic sequence and A20 = 95, Find A1​

Mathematics
1 answer:
Inessa05 [86]2 years ago
5 0

Step-by-step explanation:

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

910=n/2{2a+(n-1)d}

1820=n{2a+(n-1)d}

1820=20{2a+(20-1)d}

1820=20{2a+19d}

91=2a+19d

An=a+(n-1)d

95=a+(20-1)d

95=a+19d

91=2a+19d

---------------

4=-a

a=-4

91=2a+19d

91=2(-4)+19d

91=-8+19d

91+8=19d

99=19d

d=99/19

A=-4

You might be interested in
The area of a rectangle is 30 square meters. Find the length and width if the length is 1.45 times the width.
lyudmila [28]

Answer:

<u>The length of the rectangle is 14.5√6/29 or 6.6 meters and the width is 10√6/29 or 4.55 meters.</u>

Step-by-step explanation:

1. Let's review the information given to us to answer the question correctly:

Area of a rectangle = 30 square meters

2. Find the length and width if the length is 1.45 times the width.

Width of the rectangle = x

Length of the rectangle = 1.45x

Now substituting in the formula of the area of a rectangle, this way:

30 = x * 1.45x

30 = 1.45x²

x² = 30/1.45

x = √30/1.45

x = 10 √6/29 or 4.55 (Rounding to two decimal places)

1.45 x = 14.5 √6/29 or 6.6

<u>The length of the rectangle is 14.5√6/29 or 6.6 meters and the width is 10√6/29 or 4.55 meters.</u>

7 0
3 years ago
Multiply and simplify. b^3•b•b^4•b^2​<br>plz help asap<br>like in the next 5-10 minutes
Anastasy [175]

Answer:

What does B equal?

Step-by-step explanation:

6 0
3 years ago
Anyone a fan of Heathers? If so, wanna be friends?
Shtirlitz [24]

Answer:

Yes, I like the movie and the musical.

Step-by-step explanation:

I'll be your friend.

8 0
2 years ago
Which of the following expressions give the distance between the endpoints of the segment shown on the number line below? Select
Travka [436]
C)-35 -45 that would be the correct answer
7 0
2 years ago
Read 2 more answers
Is this relation a function? EXPLAIN WHY OR WHY NOT
olga_2 [115]

This relation is a function, because you are assigning one y-value to each x-value. In other words, you can perform the vertical line test: you can see that every vertical line crosses the graph at most once.

5 0
3 years ago
Other questions:
  • Identify the null and alternative hypotheses, test statistic, critical value(s) or P-value (or range of P-values) as appropriate
    10·1 answer
  • When x=12,y=8. Find x when y=12
    6·1 answer
  • Please help ASAP! I will give brainliest!
    14·1 answer
  • For which pairs of functions is (f•g)(x)=12x? f(x)=3-4x and g(x)=16x-3
    6·2 answers
  • The circumference of a circle is 18.84 yards what is the circles diameter
    11·1 answer
  • Based on a poll, 69% of internet users are more careful about personal information when using a public Wi-Fi hotspot.
    8·1 answer
  • Can some 1 do that for me please​
    8·1 answer
  • HELP PLEASEEE!!! ILL GIVE BRAINLIEST
    14·1 answer
  • One way to prove that a quadrilateral is a parallelogram is to show that
    12·1 answer
  • What is the volume of the cone
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!