Martina begins a dive at sea level. she dives down 20 feet, and then rises 7 feet. she dives again, going down 9 more feet. how far below sea level is martina? martina is feet below sea level.+

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?

What is the value of x? enter your answer in the box.

A+b= 17, ab=70, find the value of |a-b|