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3 years ago

DUM89 THIS QUESTION IS FOR YOU

Mathematics

2 answers:

grin007 [14]3 years ago

5 0

Answer:

Step-by-step explanation:

9. (x+12)(x-3)/(x-3)= x+12

10. (x-15)(x+3)/(x+3)= x - 15

11. (x-8)^2/(x-8)= x - 8

12. (x-30)(x+3)/(x+3)= x - 30

13. (x+15)(x-2)/(x-2)= x + 15

Effectus [21]3 years ago

3 0

Answer:

x+12 x-15 x-8 x-30 x+15

Step-by-step explanation:

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3 years ago

John’s father is 5 times older than John and John is twice as old as his sister Alice. In two years time, the sum of their ages

oksano4ka [1.4K]

Answer:

John’s age is 8 years

Step-by-step explanation:

Let

x -----> John’s father's age

y -----> John’s age

z -----> John’s sister's age

we know that

$x=5y$ -----> equation A

$y=2z$

$z=y/2$ -----> equation B

$(x+2)+(y+2)+(z+2)=58$

$x+y+z+6=58$

$x+y+z=52$ -----> equation C

Substitute equation A and equation B in equation C and solve for y

$5y+y+y/2=52$

Multiply by 2 both sides to remove the fraction

$10y+2y+y=104$

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<em>Find the value of x</em>

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<em>Find the value of z</em>

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therefore

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John’s age is 8 years

John’s sister's age is 4 years

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3 years ago