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2 years ago

A father is 25 years old . Six years ago he was 5 times as old as his son. Find the present age of Father and son.

Mathematics

1 answer:

raketka [301]2 years ago

5 0

Answer:

Define F as fathers age and S as sons age right now.

Then now they are

(1) 3S = F

and six years ago they were

(2) 5*(S-6) = F-6

calculate 5*(S-6)

5S - 30 = F-6

Subtract left and right side by -F

Add 30 to left and right side

5S - F = 24

Put (2) 3S = F into the equation above

5S - 3S = 24

2S = 24

S = 12

insert result in (2) 3S = F

3*12 = F

36 = F

Step-by-step explanation:

So the son is 12 years, and the father is 36 years.

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Does anyone know how to do this? Thanks!

Nataly [62]

C. 5

Step-by-step explanation:

The coeff of

${x}^{5}$

Is 15.

So by that we can write 3m = 15

m is 5.

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2 years ago

A Store owners offers a discount of 20% off the regular price of all jackets. Jessica has a coupon that gives her an additional

Deffense [45]

Answer:

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3 0

2 years ago

Expand and simplify (x+5)(x-2)

salantis [7]

Answer:

${x}^{2} - x - 12 = (x + 3)(x - 4)$

${x}^{2} + 3x + 2 = (x + 2)(x + 1)$

${x}^{2} + 3x - 10 = (x + 5)(x - 2)$

Step-by-step explanation:

F [First terms] - Multiply the first terms in each set of parentheses FARTHEST TO THE LEFT

O [Outside terms] - Multiply the first term in the first set of parentheses FARTHEST TO THE LEFT by the last term in the second set of parentheses FARTHEST TO THE RIGHT

I [Inside terms] - Multiply the last term in the first set of parentheses FARTHEST TO THE RIGHT by the first term in the second set of parentheses FARTHEST TO THE LEFT

L [Last terms] - Multiply the last terms in each set of parentheses FARTHEST TO THE RIGHT

${x}^{2} - x - 12 = {x}^{2} - 4x + 3x - 12$