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
Mila [183]
3 years ago
11

Sum to n terms the series 7 +77 +777​

Mathematics
1 answer:
julia-pushkina [17]3 years ago
4 0

Answer:

Step-by-step explanation:

=7 (1+11+111+1111......n)

=7/9 (9+99+999+9999....n)

=7/9 ((10-1)+(10^2-1)+(10^3-1)+....n)

=7/9 ((10+10^2+10^3...n)-(1+1+1+1.....n))

=7/9 ((10 (10^n-1)/(10-1))-n)

You might be interested in
NEED HELP ASAP! PLEASE HElp!!
mote1985 [20]

the answer should be C

4 0
3 years ago
You are designing an icon for a mobil app. Use the provided ruler to answer the following questions.
makkiz [27]

Answer:

a. Scale Perimeter : 2.5 centimeters

Actual Perimeter : 13 centimeters

Actual Area : 10.5 square centimeters

b. Actual Perimeter : 130 mm

Actual Area : 1,050 mm

Step-by-step explanation:

a. 2.5 mm = 0.25 cm

2 (1 + 0.25) = 2.5

2 (3.5 + 3) = 13

3.5 x 3 = 10.5

b. 3.5 cm = 35 mm 3 cm = 30 mm

2 (35 + 30) = 130

35 x 30 = 1050

7 0
2 years ago
Which ordered pair is a solution of the equation?
olasank [31]

Answer:C

Step-by-step explanation:

cause I say so.

6 0
3 years ago
What an angel adjacent to < igf
dem82 [27]

Answer:

Two angles are Adjacent when they have a common side and a common vertex (corner point) and don't overlap. Because: they have a common side (line CB)

Step-by-step explanation:

7 0
2 years ago
Read 2 more answers
the surface of jupiter is made of colorful clouds created by various chemicals in the atmosphere.the temperature at the top of t
lions [1.4K]
The temperature below the clouds. Absolute value is the distance from the number line, so basically removing the negative sign.
4 0
3 years ago
Other questions:
  • A production manager tests 10 batteries and finds that their mean lifetime is 468 hours. She then designs a sales package for th
    14·2 answers
  • Convert 302 inches into yards
    7·1 answer
  • Help please i need to pass
    12·2 answers
  • The figures show the dimensions of a tennis court and a basketball court given in terms of the width in feet of the tennis court
    13·1 answer
  • 30 POINTS Convert the expression 2 1/3 to radical form.
    6·1 answer
  • How do you simply y=(x-6)(x+7)
    8·1 answer
  • Yvette has 366 eggs to put into cartons. She puts one dozen eggs into each carton. How many cartons does she fill?
    8·1 answer
  • The stack on the left is made up of 15 pennies, and the stack on the right is also made up of 15 pennies. If the volume of the s
    6·1 answer
  • A researcher reports that the average salary of assistant professors is more than $42,000. A sample of 30 assistant professors h
    15·1 answer
  • To indirectly measure the distance across a river, Carson stands on one side of the
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!