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
stellarik [79]
3 years ago
13

An arithmetic progression has first term 11 and Fourth term 32. Fine the sum of the first nine term

Mathematics
2 answers:
bonufazy [111]3 years ago
6 0

Answer:351

Step-by-step explanation:Try to plus the same number every time, I used 7 and it worked. : )

schepotkina [342]3 years ago
4 0

Let the first term be a, 4th term be a_{4}, difference between terms be d, and sum of first nine terms be S_{9}.

a_{4} = a + 3d

32 = 11 + 3d

3d = 32 - 11

3d = 21

d = 7

S_{9} = \frac{9}{2} (2a + (9-1)d)

   = \frac{9}{2} (22+56)

   = 9(11+28)

   = 9(39)

   = 325

Sum of first nine terms is 351.

You might be interested in
Find the value of each of the following: exponents
Nataly [62]

Answer:

7) is 625

8) 169

9) 1.44

10) 180??

11) 1000000

12) 3430

hopefully these are right

Step-by-step explanation:

7 0
2 years ago
On this map, Oxford Street is perpendicular to_______ , and Rosewood Street is perpendicular to ________. Assume that the street
melamori03 [73]
Hi there!

We are looking for perpendicular angles, which means the angle between the streets is 90 degrees. So, each time we need to find the street that intersects the given street with a 90 degree angle.

On this map, Oxford Street is perpendicular to Waterloo St., and Rosewood Street is perpendicular to Oak St..

The answers are (in correct order): Waterloo St. and Oak St..
~ Hope this helps you!
6 0
3 years ago
In a hypothesis test, standard error measures ____.
Lina20 [59]

Answer:

The correct answer is:

the amount of difference expected just by chance (b)

Step-by-step explanation:

Standard error in hypothesis testing is a measure of how accurately a sample distribution represents a distribution by using standard deviation. For example in a population, the sample mean deviates from the actual mean, the mean deviation is the standard error of the mean, showing the amount of difference between the sample mean and the actual mean, occurring just by chance. Mathematically standard error is represented as:

standard error = (mean deviation) ÷ √(sample size).

standard error is inversely proportional to sample size. The larger the sample size, the smaller the standard error, and vice versa.

7 0
3 years ago
3(у - 3) - 2(у 4) = 4​
Dennis_Churaev [7]

Answer:

y = 5

Step-by-step explanation:

3(у - 3) - 2(у -4) = 4​

Distribute

3y -9 -2y +8 =4

Combine like terms

y -1 =4

Add 1 to each side

y-1+1 = 4+1

y = 5

3 0
3 years ago
Read 2 more answers
Solve for x: 4/x - x/8 = 0
Lostsunrise [7]

Answer:

x = \sqrt{32}

Step-by-step explanation:

\frac{4}{x} - \frac{x}{8} = 0\\\\\frac{4}{x} = \frac{x}{8}\\\\x^2 = 32\\\\x = \sqrt{32}

8 0
3 years ago
Read 2 more answers
Other questions:
  • I added a screenshot of my question
    5·1 answer
  • What is the radius for the circle given by the equation? 
    14·1 answer
  • A square dance floor has a perimeter of 120 yards. What is the length of a diagonal of the dance floor?
    10·1 answer
  • If I get on at the bottom of the ferris wheel, in how many degrees will it take for my car to get to the top of the ferris wheel
    5·2 answers
  • El cuadruple de un número aumentado en 2 es menor igual a 50
    10·1 answer
  • Write 91.4 million in both standard form and in scientific notation
    6·2 answers
  • Find the missing length
    9·1 answer
  • Which of the following is a monomial?<br> ОА. 20х9 – 7х<br> Ов. 9/x<br> Ос. 11х2<br> OD. 20x – 14
    9·2 answers
  • The altitude a ( in feet) of a plane t minutes after lift off is given by a=3400t+600
    12·1 answer
  • What is 4/9 - 1/12 least common moltiple
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!