If these numbers represent elevations in meters, which is the farthest away from sea level? A:7
B:-3
C:1/2
D:-0.8
E:0.8
F:-1/10
G:-2

Arley is building a model of a city map. in one part of the city, three roads form a right triangle, which harley draws as triangle abc, with the following measures: m∠b=90° and m∠a=30°. in his scale model, the hypotenuse of triangle abc, ac¯¯¯¯¯¯¯¯, has a length of 817−−√ cm. what is the value of a (the length of bc¯¯¯¯¯¯¯¯)?

Can someone me and do the problem plz so i can understand it more better

What percent of the circle below is shaded?