I need help please. I don't quite understand it! "How are we ever going to build this bridge?" asks Omar looking out across the raging river."Let's start by finding the distance to the big rock on the other side."

Melissa replies. Moving 100 meters along the river, Melissa looks back and measures the angle between Omkar and the big rock: 33°. Melissa then instructs Omar to measure the angle between Melissa and the big rock.

From his vantage point, Omar sees an angle of 98° between Melissa and the big rock.

Jeffery conducted a survey in his school and found that 30 of the 50 eighth grade students' favorite subject is mathematics. based on the results, jeffery concluded that out of the 200 students in his school, 120 students' favorite subject is mathematics. select the statement that is true about jeffery's conclusion. a. jeffery's conclusion is not valid because the sample was biased since only 200 students were surveyed. b. jeffery's conclusion is valid because the sample was random since all of the students were eighth grade students. c. jeffery's conclusion is valid because the sample was random. d. jeffery's conclusion is not valid because the sample was biased since all of the students were eighth grade students.

Answer this question only if you know the 30 points and

Simplify using positive exponents only.