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
Paul [167]
3 years ago
13

(a) Find the common difference of an A.P. whose first term is 5 and the number of terms is 30 and sum 1455.

Mathematics
1 answer:
Alexxandr [17]3 years ago
4 0
Sum = n/2[2a + (n - 1)d] where a = first term, n = number of terms and d = common difference

(a) 30/2(2 x 5 + (30 - 1) x d) = 1455
10 + 29d = 1455 / 15
29d = 97 - 10
d = 87 / 29 = 3

(b) 7/2(2 x 9 + (7 - 1)d) = 0
18 + 6d = 0
6d = -18
d = -3
You might be interested in
Pls say the value pls​
Luda [366]

Answer:

It's 21 because if you times Length×width= the area

5 0
2 years ago
Using both the rotation matrices earlier in this lesson and your matrix calculator, find each determinant.
Trava [24]

Answer:

both are one

8 0
3 years ago
Read 2 more answers
7 1/8 is equal to greater than or less than 7.025
Sauron [17]
7 1/8 is greater than 7.025
4 0
3 years ago
Tracy has a long weekend coming up, and she wants to spend all 3 days camping at Moose Hill Forest. She
PSYCHO15rus [73]

Answer:

a 75% chance the weather will stay dry

Step-by-step explanation:

3/4

8 0
2 years ago
2a+3b=5<br> b=a-5 help please
diamong [38]

Answer:

2a + 3b = 5

b = a - 5

Step-by-step explanation:

2a + 3b = 5

b = a - 5

You can write this another way:

2a + 3(a-5) = 5 ( I added the second formula in the first one )

Now you gotta factor out:

2a + 3a - 15 = 5

Here im gonna do plus 15

2a + 3a = 20 ==> 5a = 20

Now if you divide by 5, you get: a = 4

Now you can fill in the second formula again

b = a - 5 (ill fill this in now)

b = 4 - 5 = -1

So, this makes:

a = 4 , b = -1

6 0
3 years ago
Read 2 more answers
Other questions:
  • How do we get an<br> equation in slope-intercept form?
    12·1 answer
  • Ann is grouping 38 rocks. She can put them into groups of 10 rocks or as single rocks. What are the different ways Ann can group
    14·2 answers
  • Answer this question please! 25 points and brainliest!
    15·2 answers
  • What is the answer to 40=-6t-8 ?
    5·2 answers
  • The volume of two spheres is shown:
    13·1 answer
  • Carmen used a random number generator to simulate a survey of how many children live in the households in her town. There are 1,
    5·1 answer
  • What is the value of k used to find the coordinates of a point that partitions a segment into a ratio of 5:3?
    7·2 answers
  • What is the surface area, in square millimeters, of the solid? You don’t have to show work, just tell me the answer
    15·2 answers
  • Compare -7 and -10 which is greater​
    6·1 answer
  • Emily has saved $74 toward a new sound system that costs $149. She plans on saving an additional $15 each week. How many weeks w
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!