1+ [2+x] =9 A. X=7 or x = -11 B. X=5 or x= -9 C. X=4 or x= -8 D. X=6 or x= -10

Mathematics

2 answers:

mario62 [17]2 years ago

7 0

X=6 if you simplify both sides of the equation

Vikentia [17]2 years ago

3 0

D is the correct answer, first you have to write to you equations 1+ the absolute value of 2+ X equals nine and 1+ the absolute value of 2+ X equals -9 then you must subtract one from both sides

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We know that sum of an Arithmetic Progression(A.P.) is given by:

where 'n' denotes the "number" of digits whose sum is to be determined, 'a' denotes the first digit of the series and '' denote last digit of the series.

Now the sum of even numbers i.e. 2+4+6+8+....+100 is given by the use of sum of the arithmetic progression since the series is an A.P. with a common difference of 2.

image with explanation

Hence, sum of even numbers from 1 to 100 is 2550.

Also the series of odd numbers is an A.P. with a common difference of 2.

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Hence, the sum of all the odd numbers from 1 to 100 is 2500.

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Step-by-step explanation: