Plz help with algebra! 50 POINTS + BRAINLIEST! random answers will be reported.

Find the distance between the point (-3,-4), and (see the picture below)

Cesar bought 7 items at the candy store. he bought candy bars for $0.50 each and packs of gum for $0.95 each. he spent a total of $6.80. what system represents the solution for the number of candy bars (x) and the number of pack gum (y) purchased?

Solve the proportion of 16/50=x/156.25