Adam is twice as old as his brother, Adain. Adam is 8-years-old. Write and solve an equation to find out how old Adian is.

Let adrian's age be x

Adam is twice as old

Adam = 2x

Adam = 8

2x=8

x=4

Adain is 4 years old

answer

d. 10

explanation

the distance from point y to wx is the height of the triangle.

using pythagoras theorem,

group similar terms to get,

this implies that,

take positive square root of both sides to get,

this implies that,