Amouse is trapped in a maze. to find his way out he walks 10 m, makes a 90° right turn, walks 5 m, makes another 90°, and walks 7 m. what is the magnitude of the resultant vector? round to the nearest tenth

What is the value of y? round to the nearest tenth

Avery’s piggy bank has 300 nickels, 450 pennies, and 150 dimes. she randomly picks three coins. each time she picks a coin, she makes a note of it and puts it back into the piggy bank before picking the next coin.

Can someone me with my math problem pls my teacher is on my back about this