All categories

3 years ago

A father is 60 years old and his son is half his age how old was the boy when his father was four times his age

1 answer:

5 0

F=60, s=60/2=30

(60-x)/(30-x)=4

60-x=120-4x

60+3x=120

3x=60

x=20

s=30-x

s=30-20

s=10

So the boy was 10 years old when his father was four times his age.

You might be interested in

3 quarters equals how many dimes

Veseljchak [2.6K]

1 quarter = 25 cents.

1 dime = 10 cents.

3 quarters = 3*25 = 75 cents.

10 cents = 1 dime.

75 cents = 75 / 10 dimes

= 7.5 dimes.

Therefore 3 quarters equal 7.5 dimes.

8 0

3 years ago

(Will give brainiest) 5y - x = 10 4x - 4y = 1 12 = 6x + 3y

kow [346]

Is there any answer choices to what we are looking for?

7 0

3 years ago

Use the discriminant to find the number and type of solution for x^2+6x=-9

likoan [24]

Answer:

D = 0; one real root

Step-by-step explanation:

Discriminant Formula:

$\displaystyle \large{D = {b}^{2} - 4ac}$

First, arrange the expression or equation in ax^2+bx+c = 0.

$\displaystyle \large{ {x}^{2} + 6x = - 9}$

Add both sides by 9.

$\displaystyle \large{ {x}^{2} + 6x + 9 = - 9 + 9} \\ \displaystyle \large{ {x}^{2} + 6x + 9 = 0}$

Compare the coefficients so we can substitute in the formula.

$\displaystyle \large{a {x}^{2} + bx + c = {x}^{2} + 6x + 9 }$

a = 1
b = 6
c = 9

Substitute a = 1, b = 6 and c = 9 in the formula.

$\displaystyle \large{D = {6}^{2} - 4(1)(9)} \\ \displaystyle \large{D = 36 - 36} \\ \displaystyle \large{D = 0}$

Since D = 0, the type of solution is one real root.

6 0

2 years ago

What is the absolute value of -4/5,1/2,0.2,and -0.5

nirvana33 [79]

4/5 1/2 0.2 0.5 and apparently theres a character limit

3 0

3 years ago

Read 2 more answers

Find the first, fourth, and eight terms of the sequence: A(n)=-5•3n-1

lys-0071 [83]

A (1)= -5×3(1)-1

a(1)= -5×3-1

a (1)= -16

A(4)= -5×3(4)-1

a (4)= -5×12-1

a( 4) = -60-1

a(4)= -61

A(8)= -5×3(8)-1

a(8)= -5×24-1

a(8)= -120-1

a(8)= -121

Please vote my answer branliest! Thanks.

6 0

3 years ago