A50-foot tree casts a shadow 75 feet long. the sine of the angle between the ground and the line that connects the tip of the shadow to the top of the tree is

a- .31

b- .55

c- .82

d- .67

B. 0.55
It is a right triangle with legs of 50(tree) and 75(shadow). The line that connects the tip of the shadow to the top of the tree is the hypotenuse which is approximately 90.139 or √8125. I used the pythagorean theorm to find this. The sine is opposite over hypotenuse or 50÷√8125 = 005547...