2 years ago

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Mathematics

2 answers:

babunello [35]2 years ago

7 0

D is the answer because it’s irrational

nordsb [41]2 years ago

4 0

√99 is an irrational number

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raj and his sister zia are both at secondary school. Raj is three years older than zia. the sum of the squares of their ages is

steposvetlana [31]

Let's assume

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Zia's age is y years

we are given

Raj is three years older than zia

so, we get

$x=y+3$

now, we can solve for y

$y=x-3$

the sum of the squares of their ages is 369

so, we get

$x^2+y^2=369$

now, we can plug back y

$x^2+(x-3)^2=369$

now, we can solve for x

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$x=-12 , x=15$

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so, we will only consider positive

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now, we can find y-value

$y=15-3$

$y=12$

So,

Raj's age is 15 years

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