The sum of two numbers is 30 and their difference is 12, what are the two numbers

Mathematics

2 answers:

Nadya [2.5K]3 years ago

6 0

Answer:

Sum: 21 + 9 = 30

Difference: 21 - 9 = 12

Tju [1.3M]3 years ago

3 0

Step-by-step explanation:

Let the number is a and b

The sum of two numbers =30

so,a+b=30 ............(1)

The difference of two number =12

so,a-b=12 .................(2)

If we add two equation (1) and (2)

we get,

a+b+a-b=30+12

2a=42

$\tt{ a=\dfrac{42}{2} }$

$\tt{ a=21 }$

so,one number is a=21

if we put the value a in (2) equation

we get,

a-b=12

21-b=12

b=21-12

b=9

so,the another number is=b=9

$\tt{ the~two~ number~ are~ 21 ~and~ 9 }$

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Elodia [21]

Answer:

The left end approaches to + Infinite being an exponential function, and the right end to 0

Step-by-step explanation:

we have to remember the exponential function, the best way to find the answer is plotting the graph or arranging a table of values.

As you can see in the attached graph the y axis gets closer and closer to 0 as it moves forward in the x axis, and as it moves to the left the y axis starts increasing rapidly.

Also you got to keep in mind the way that functions behave in terms of the sign of its variable. for example the 10 in this equation only makes the curve to get wider, but if you change the sign to minus, the answer would be different.