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3 years ago

I don’t understand how to solve 3.8+6(0.9) = 8.6

Mathematics

1 answer:

Julli [10]3 years ago

3 0

Answer:

The answer =-0.6

Step-by-step explanation:

Now you have 3.8 +6(0.9)=8.6 first subract 3.8 from 8.6 and then subract 5.4(you got 5.4 from multiplying from 6x0.9) from 4.8 and tne you get the total of -0.6

Hopefully that helps

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3 years ago

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svetoff [14.1K]

Answer:

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Step-by-step explanation:

Let x represent age of younger child.

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$x^2+(x+5)^2=97$

Let us solve for x.

$x^2+x^2+10x+25=97$

$2x^2+10x+25-97=0$

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$x^2+5x-36=0$

$x^2+9x-4x-36=0$

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$(x+9)=0 ; (x-4)=0$

$x=-9 ; x=4$

Since age cannot be negative, therefore, age of younger child is 4 years.

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Therefore, the age of older child would be 9 years.

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Square of 9: $9^2=81$ .

Square of mother's age: $1681$

To find mother's age, we need to take positive square root of 1681 as:

$\sqrt{1681}=41$

Therefore, the mother is 41 years old.

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