3 years ago

Are there about 100 elements

Mathematics

2 answers:

rjkz [21]3 years ago

4 0

Yea but there are precisely 118 total that we know of

Mrac [35]3 years ago

3 0

There are about 100 elements, I believe that there were 115 elements in 2001 , now the periodic table contains 118 elements .

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frosja888 [35]

Answer: 21 & 18

Step-by-step explanation:

Sum of two numbers is 39

Difference is 3

Let the numbers be x & y

X+y=39........equation 1

X-y=3...........equation 2

X=3+y............equation 3

Substitute equation 3 into equation 1

(3+y)+y=39

3+y+y=39

3+2y=39

2y=39-3

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Y=36/2

Y=18

Substitute for y in equation 2

X-y=3

X-18=3

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3 years ago

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ddd [48]

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vlada-n [284]

Answer:

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it would be more efficient to do the substitution method bc its faster and easier

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