Don't know where to start, would be great if somebody could me !

The answer to your question is AB = 16.25

Step-by-step explanation:

Data

AC = 10.01 = adjacent side

AB = ? = hypotenuse

m∠A = 52°

Process

1.- Use trigonometric functions to find AB

As we have ∠A, we use cosine to find the hypotenuse

               hypotenuse = adjacent side / cos α

2.- Substitution

               hypotenuse = 10.01 / cos (52)

               hypotenuse = 10.01 / 0.616

3.- Simplification and result

               hypotenuse = AB = 16.25                

AB = 16.23 to 2 decimal places.

Step-by-step explanation:

cos 52 = 10 / AB

AB =  10 / cos 52

AB =  10/0.616

AB = 16.234

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value