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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)

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Mya only used the dimensions from the scale drawing of a rectangle

Step-by-step explanation:

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Is 0.1304347826 a rational number?
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Yes it is a rational number
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3 years ago
Solve:7 +42-32-32 = 14.3-2a +7<br> A = -3<br> A= 0<br> A= 3<br> no solution
madreJ [45]

Answer:

a = 18.15

Step-by-step explanation:

7+42-32-32=14.3-2a+7

Combine like terms on the left side of the equation first. Add 7 and 42, then subtract 32 from the answer you get, then subtract 32 from that answer. This is going by order of PEMDAS.

Remember PEMDAS: (numbers 3 & 4 and numbers 5 & 6 are solved from left to right)

  1. Parentheses
  2. Exponents
  3. Multiplication
  4. Division
  5. Addition
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-15=14.3-2a+7

After combining like terms on the left side, you get -15. Now combine like terms on the right side of the equation by adding 14.3 and 7.

-15=21.3-2a

Get -2a alone by subtracting 21.3 from both sides.

-36.3=-2a

Divide both sides by -2.

a=18.15

In this equation, a should equal \boxed{18.15}.

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2 years ago
How do you know when to add numbers? what is the sign rule
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The most familiar case is that where you see a " + " sign between two numbers; that's an indication to add the two numbers (or terms) together.

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\boxed{y =  \frac{8x-11}{9} }
5 0
3 years ago
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