There are 20 students in Sara's class eight of the students are boys which model represents the ratio of boys to girls in the class

Which of these equations, when solved, gives a different value of x than the other three? a9.1 = -0.2x + 10 b10 = 9.1 + 0.2x c10 – 0.2x = 9.1 d9.1 – 10 = 0.2x

Ahiker stands at an unknown elevation before he ascends 2 miles up a mountain to an elevation of 9 miles. find the elevation of the hiker before his ascent.

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?