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
Travka [436]
3 years ago
9

The second term of arithematic proggresions 7. and the sum of the first four termd is 12 find

Mathematics
1 answer:
Elza [17]3 years ago
3 0

Answer:

a) a1=15 first term

b) d=-8 common difference

Step-by-step explanation:

1)a1+d=7

2)a1+a2+a3+a4=12

a1+a1+d+a1+2d+a1+3d=12

4a1+6d=12

2a1+3d=6

We have the system of equations where a1+d=7 and 2a1+3d=6

3a1+3d=21

2a1+3d=6

Subtract the second equation from the first one

a1=15

d=-8

You might be interested in
The price of jeans was reduced $6 per week for 7 weeks. By how much did the price of the jeans change over the 7 weeks?
Nataliya [291]
The price changed by $42 over the course of seven weeks
3 0
3 years ago
Read 2 more answers
Please help me please
Contact [7]

Answer:

458

Step-by-step explanation:

6 0
3 years ago
Find the midpoint of the segment with the given endpoints. (9.-9) and (2.-10)​
kondor19780726 [428]

Answer:

\boxed{ \bold{ \huge{ \boxed{ \sf{(5.5 \: , \: -  9.5)}}}}}

Step-by-step explanation:

Let the points be A and B

Let A ( 9 , -9 ) be ( x₁ , y₁ ) and B ( 2 , - 10 ) be ( x₂ , y₂ )

<u>Finding</u><u> </u><u>the</u><u> </u><u>midpoi</u><u>nt</u>

\boxed{ \sf{midpoint = ( \frac{x1 + x2}{2} , \frac{y1 + y2}{2} }}

\longrightarrow{ \sf{midpoint = ( \frac{9 + 2}{2} , \:  \frac{ - 9  + ( - 10)}{2}}} )

\longrightarrow{ \sf {midpoint = ( \frac{11}{2} \: , \:  \frac{ - 9 - 10}{2}})}

\longrightarrow{  \sf{midpoint = (5.5 \: , \:  \frac{ - 19}{2}}} )

\longrightarrow{ \sf{midpoint = (5.5 \: , - 9.5}})

Hope I helped!

Best regards! :D

5 0
2 years ago
Help plssssssssssssssssss
valentinak56 [21]

Answer:

It would be C.

Step-by-step explanation:

This is because they allow it to be 50 dollars and less, making it C.

3 0
2 years ago
Please helppp i will mark brainlistt!!!!!!
Citrus2011 [14]

Answer:

26 square meters ♡♡♡♡♡♡♡♡♤◇◇♤£¥

6 0
2 years ago
Other questions:
  • *REMEMBER THAT IN STANDARD FORM YOU CANT USE FRACTIONS!!!
    12·2 answers
  • What is the solution to the equation? t(8 – 3) = 2 • 8 – 2 • 3 A. 3 B. –3 C. 8 D. 2
    14·1 answer
  • According to this diagram, what is tan 74
    13·2 answers
  • What would the busked of x be?
    14·2 answers
  • Which inequality comparing two of the expressions below is true when 0.5
    8·1 answer
  • Estimate the circumference of a circle that has a diameter of 13 yards.
    15·1 answer
  • Find the value of x to the nearest degree.
    6·1 answer
  • If you know how to solve this, Please answer it. Thank You
    7·1 answer
  • A1=-3, r= -3, n = 10
    5·2 answers
  • Hello! Can you, please, explain how to solve this kind of equation "Find m+n, if P(x) = (2m-4)x^2+(5-n)x+13 is constant polynomi
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!