Maria's age is 20. Her father's age is 50. In how many years will Maria's father be twice as old as Maria will be?

10 years

Step-by-step explanation:

Maria’s father is 50.

Maria is 20.

Let x be the number of years.

50 + x = 2(20 + x)

50 + x = 40 + 2x

50 - 40 = 2x - x

10 = x

step-by-step explanation:

first, eliminate the parenthesis:

3

x

+

2

−

4

x

second, group like terms:

3

x

−

4

x

+

2

third, combine like terms:

(

3

−

4

)

x

+

2

→

−

1

x

+

2

→

−

x

+

2

definitely a. the others have almost all data points on one side of the line.

step-by-step explanation: