The function varies directly with x and when x = 30.
f(x)
f(x) = 90
what is when x = 6?
f(x)

In words, the image assigned to is 18.

Step-by-step explanation:

Givens

When a function varies directly, it means that function is linear, and it has a direct proportion between variables, so can be modeled by , where is the constant ratio of change.

So, in this case, the ratio of change is

That means the linear function that represents this situation is

So, if , then

Therefore,

he spend 5.1 minutes chatting with his friends.

step-by-step explanation:

2/5+1/2=9/10

6/1-9/10=5.1