Since no one cared to help last time I posted this Pls help, also explain to me how this works and how to do this I have no idea what all of this is

Find the given elements if matrix d:

Can (3,5 and square root 34) be sides on a right triangle?

Afruit stand has to decide what to charge for their produce. they need $10 for 4 apples and 4 oranges. they also need $15 for 6 apples and 6 oranges. we put this information into a system of linear equations. can we find a unique price for an apple and an orange?