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
cricket20 [7]
3 years ago
15

Calculate the sum of the first 30 terms in the sequence that begins with 70,65,60

Mathematics
1 answer:
Afina-wow [57]3 years ago
4 0

\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\la\la\la\la\ddddddddddddddddddddddddddddddddcleverdddddd\ffffffffffffffffffffffffffffffffffffffff\pppppppppppppppppppppppppppppppppppp\ddddddddddddddddddd \displaystyle \Large \boldsymbol{} a_1=70  \  ; \ d=-5  \\\\S_n=\frac{a_1+a_n}{2} \cdot n \ ; \ a_n=a_1+(n-1)d \Longrightarrow \\\\\\ S_{30}=\frac{70+70-29\cdot5}{2} \cdot 30 =-75 \\\\\\Answer: S_{30}=-75

You might be interested in
Proof true or false: For all integers a,b,and c,if ab|c then a|c and b|c
olya-2409 [2.1K]

Answer with explanation:

It is given that for three integers , a, b and c, if

              \frac{ab}{c}\rightarrow then, \frac{a}{c} \text{or} \frac{b}{c}

Since , a b is divisible by c , following are the possibilities

1.→ a and b are prime integers .Then , c will be prime number either equal to a or b.

2.→a and b are not prime integers ,then any of the factors of a or b will be equal to c.For example:

 ⇒a=m × n

 b=p × q× c

or,

⇒a=u×v×c

b=s×t

So, whatever the integral values taken by a, and b, if \frac{ab}{c} then either of  \frac{a}{c} \text{or} \frac{b}{c} is true.

4 0
3 years ago
Simplify by combining like terms <br> 7x + 3 (2x-6) - 10 - 7x
ruslelena [56]
6x-28 is what I got for this
3 0
3 years ago
Read 2 more answers
What is the average speed of the zebra during the time between 0s and 40s
Len [333]
You would have to know the rate that it is going at to solve it I think
7 0
3 years ago
Solve the inequality 3x-1&gt;-6x​
Ghella [55]

Answer:

x > 1/9

Step-by-step explanation:

Given that:

3x-1>-6x​

Adding 6x + 1 on both sides we get

3x-1 + 6x + 1>-6x​ + 6x +1

3x +  6x > 1

Adding both variables

9x > 1

Dividing both sides b 9 we get

9x/9 > 1/9

x > 1/9

I hope it will help you!​

3 0
3 years ago
How do you solve the equation 3x = 9 by multiplying 3 to both sides
notka56 [123]
Whenever you see <em>x </em> next to a 3, and it says that it equals 9, you know that 3•3=9.
5 0
3 years ago
Read 2 more answers
Other questions:
  • How many degrees warmer is a temperature of 13°F than a temperature of -19°F?
    5·2 answers
  • Find solution to initial value problem: y'' +4y' +7y = 0; y(0) = 1, y'(0) = -2
    12·1 answer
  • 12. What is a pronoun?
    9·1 answer
  • Simplify: 3.7|4-13|+7^2 -61.86<br> A) -144.16<br> B) 16.16<br> C) 20.44<br> D) 86.44
    15·2 answers
  • May someone help me out with this please please
    9·1 answer
  • Target sells 24 bottles of water for $3, and 36 bottles of water for $4. Which is the better buy and by how much?
    7·1 answer
  • OTTIS WHAT IS THY ANSWER TO THIS QUESTION<br> 7+62
    13·2 answers
  • a hospital spokesperson states that 2% of emergency rooms visits by college undergraduates are for alcohol related health proble
    11·1 answer
  • Answer number 16 about scientific notation please:)
    14·1 answer
  • At a certain time, a post 6 ft. tall casts a 3 ft. shadow. What is the angle of elevation of the sun? Round your answer to the n
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!