A metal weighs 180 grams, and is 162 grams of silver. What percent of the bar is silver?

Ineed i been stuck on this question since yesterday

What will the graph look like for a system of equations that has no solution? a. the lines will be perpendicular. b. the lines will cross at one point. c. both equations will form the same line. d. the lines will be parallel.

If a flying disk is 139 meters in the air and travels at an average of 13 m/s how long is it in the air