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Vera_Pavlovna [14]
3 years ago
9

in an ap,the first term of an arithmetic series is 5,the last term is 45 and the sum is 400. find the number of terms and common

difference​
Mathematics
2 answers:
Olegator [25]3 years ago
8 0

Answer:

.........................

Akimi4 [234]3 years ago
5 0

Answer:

Hi mate,

Step-by-step explanation:

Sn = n/2 (a+ l)

400 = n/2 ( 45 +5 )

400= N/ 2 (50)

400 = 25n

n =400/25 = 16

a n = a + ( n - 1 ) * d

45= 5 + (16-1) * d

45 = 5+ 15 d

40= 15 d

d = 40/ 15

=8/ 3

i HOPE IT IS CLEAR

PLS MARK ME AS THE BRAINLIEST

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Answer:

The answer to your question is:    83 + 6\sqrt{35}

Step-by-step explanation:

This is a square of a binomial.

                                  (2\sqrt{5} + 3\sqrt{7} )^{2}

1.- Square of the first term

                               ( 2\sqrt{5} )^{2} = 4(5) = 20

2.- Twice the product of the two terms

               (2)(2\sqrt{5} )(3\sqrt{7} ) = 6\sqrt{35}

3.- Square of the second term

                              (3\sqrt{7)})^{2} = 9(7) = 63

4.- Write the solution

                           20 + 6\sqrt{35} + 63

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Answer:

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³

Step-by-step explanation:

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