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solniwko [45]
3 years ago
5

Someone please help me will give BRAILIEST!!!!!

Mathematics
2 answers:
alina1380 [7]3 years ago
8 0
The answer would be a . $43.2 because your multiplying the number by 0.08
DedPeter [7]3 years ago
5 0
The answer is 43.2 (A). because 540 is the value for t (kilowatts), you substitute this into the equation, giving you an equation of C=.08*540, which gives you  final answer of $43.2. Hope this helps! :D
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Use induction to show that 12 + 22 + 32 + ... + n2 = n(n+1)(2n+1)/6, for all n > 1.
dlinn [17]

Answer with Step-by-step explanation:

Let P(n)=1^2+2^2+3^2+.....+n^2=\frac{n(n+1)(2n+1)}{6}

Substitute n=2

Then  P(2)=1+2^2=5

P(2)=\frac{2(2+1)(4+1)}{6}=5

Hence, P(n) is true for n=2

Suppose that P(n) is true for n=k >1

P(k)=1^2+2^2+3^2+...+k^2=\frac{k(k+1)(2k+1)}{6}

Now, we shall prove that p(n) is true for n=k+1

P(k+1)=1^2+2^2+3^2+...+k^2+(k+1)^2=\frac{(k+1)(k+2)(2k+3)}{6}

LHS

P(k+1)=1^2+2^2+3^2+.....+k^2+(k+1)^2

Substitute the value of P(k)

P(k+)=\frac{k(k+1)(2k+1)}{6}+(k+1)^2

P(k+1)=(k+1)(\frac{k(2k+1}{6})+k+1)

P(k+1)=(k+1)(\frac{2k^2+k+6k+6}{6})

P(k+1)=(k+1)(\frac{2k^2+7k+6}{6})

P(k+1)=(k+1)(\frac{2k^2+4k+3k+6}{6})

P(k+1)=\frac{(k+1)(k+2)(2k+3)}{6}

LHS=RHS

Hence, P(n) is true for all n >1.

Hence, proved

4 0
3 years ago
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Blababa [14]
I think the answer is this,I am not sure.....

7 0
3 years ago
What is 7x plus 5 plus 8x?
jarptica [38.1K]

Answer:

The answer is 15x+5

Step-by-step explanation:

1. Combine like terms (numbers with the same variable) (just add 7 & 8 and add an x)

2. Bring the rest down

3. After you combined like terms make sure you bring the variable down to it's proper spot

5. Hope this helps.. :)

8 0
3 years ago
A circle is drawn within a square as shown. What is the best approximation for the area of the shaded region? Use 3.14 to approx
fgiga [73]
In the shown picture, To find the shaded area we need to find the total area of the square, subtracted by the area of the circle.

the area of the shaded region = the area of the square - the area of the circle

the area of the square = L² = 7² = 49 cm²

the area of the circle = πr² = 3.14 x 3.5² = 38.5 cm²

the area of the shaded region = 49 - 38.5 = 10.5 cm²

3 0
3 years ago
Multiply 3 1/2 x 3 1/2 what is it ???
Andrej [43]

Answer:

12 1/4

Step-by-step explanation:

convert fractionj into decimals then cvert product into fraction

6 0
3 years ago
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