3 years ago

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

A house purchase five years ago for $100,000 was just sold for $135,000 assuming exponential growth approximate their annual gro

Andreyy89

Answer:

25.9%

Step-by-step explanation:

100000÷13500×100

=74.074
100-74.074

Subtract the 74.074 because 100000 is 74.074 of 135000

8 0

2 years ago

Can you please help me

scoundrel [369]

Answer:

Place the dot at 11 and make it go to the right make sure the dot is full not open. Solution is $x \geq 11$

Step-by-step explanation:

4 0

3 years ago

Fundamental Theorem Algebra II

Rama09 [41]

There is like no picture or description

8 0

3 years ago

2. David bought milk for $1.50, cream cheese for $ 1.99 and butter for $ 5.99 What is the cost of the milk and the butter?

scoundrel [369]

Answer:

You would get $40.52 back.

Step-by-step explanation:

1.50+1.99+5.99

$9.48

50-9.48=40.52

You would get $40.52 back.

4 0

3 years ago

Read 2 more answers

Using f(x) = 2x + 7 and g(x) = x - 3, find f(g(x)).

Eva8 [605]

Answer:

2x+1

Step-by-step explanation:

that's a hard question

we know that g(x)= x-3

so f(g(x))= f(x-3)

we put it in the equation :

f(x-3)= 2(x-3) +7 = 2x-6+7 = 2x +1

6 0

3 years ago

Sum to n terms the series 7 +77 +777​

Sum to n terms the series 7 +77 +777