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yawa3891 [41]
3 years ago
13

Please help with Q. b) ii)

Mathematics
1 answer:
ANEK [815]3 years ago
5 0
So for a mother ages 28 , there is a chance of 1 in 1000 , but at the age of 38 there is a chance of 1 in 200 . to work out how many times more likely it is for the 38 year old to give birth to a child with down syndrome is to divide 1000 by 200 and this gives us 5 . so the 38 year old is 5 times more likely to give birth to a child with down syndrome than a 28 year old :)
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factorise the following 1. x²-2x+15.... 2. y²-19y+90​
Marta_Voda [28]

Answer:

1. x²-2x+15

This can't be factored, I've tried multiple ways now, but it just can't be factored.

2. y²-19y+90​

Let's factor y^2−19y+90

y^2−19y+90

The middle number is -19 and the last number is 90.

Factoring means we want something like

(y+_)(y+_)

Which numbers go in the blanks?

We need two numbers that...

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   Multiply together to get 90

Can you think of the two numbers?

Try -9 and -10:

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   -9*-10 = 90

Fill in the blanks in

(y+_)(y+_)

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(y-9)(y-10)

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(y−9) (y−10)

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