Let the number of hours Brian travelled = X
Then the number of hours Anne traveled = 5X + 2
Since they together travelled 20 hours, then
X + ( 5X + 2) = 20
X + 5X + 2 = 20
6X + 2 = 20
6X = 20 - 2
6X = 18
X = 18/6
= 3 hours.
So brian travels for a period of 3 hours.
Now the number of hours Anne travelled = 5X +2
= (5 * 3) + 2
= 15 + 2
= 17 hours.
Hi!
Could you provide a picture of the graph please??
Otherwise I have a hard time answering :/
But I’m really good a graphs! Just provide a picture and I will definitely help!
Many lucks coming your way!
The answer is <span>3.How many hours do you spend each week in the language lab? because the question asked about the use of the lab not where it is. hope it helps : )</span>
First find the gradient by using partial derivatives.

Sub in given point (0,-1,2) for x,y,z
∨

Next, find unit vector from directional vector (0,-1,2) --> (-3,4,-3)

Finally, use dot product on gradient and unit vector to get directional rate of change.
Answer is approx 61.398
15=4(3)+3 so 15 is the value of the dependent variable