Tyler is 4 years older than tiffany in ten years he will be twicse as old a tifinay.

For this case we have to:

x: Variable that represents Tyler's age

y: Variable that represents Tiffany's age

According to the data of the statement we can propose the following equations:

To solve we substitute the first equation in the second equation:

So, Tiffany is 14 years old.

Then Tyler has:

Tyler is 18 years old.

Tyler: 18 years old

Tiffany: 14 years old

the forst and 3rd

step-by-step explanation:

it is a. 4.2 because 7.6-3.4 gets the remaining length of 4.2. i might be wrong but i am pretty sure this is the answer.