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Sonja [21]
3 years ago
15

Solve 0.9 x + 5.1 x -7= 2(2.5x-3). how many solutions dose the equation have?

Mathematics
1 answer:
Nataly [62]3 years ago
4 0
The equasion has only one solution.

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Step-by-step explanation:

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factorise the following 1. x²-2x+15.... 2. y²-19y+90​
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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...

   Add together to get -19

   Multiply together to get 90

Can you think of the two numbers?

Try -9 and -10:

   -9+-10 = -19

   -9*-10 = 90

Fill in the blanks in

(y+_)(y+_)

with -9 and -10 to get...

(y-9)(y-10)

Answer:

(y−9) (y−10)

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Alessandro and Francesca raced each other home from school. It took Francesca 13/15 as long as Alessandro to run home. Who got h
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