Janelle randomly surveyed 50 students. She found that 42 of the students had been to a music concert. There are 2,870 students at the
school. Based on her survey, about how many students in the school
have been to a music concert?

(a) calculate the molarity of a solution that contains 0.0345 mol nh4cl in 400 ml of solution. (b) how many moles of hno3 are present in 35.0 ml of a 2.20 m solution of nitric acid? (c) how many milliliters of 1.50 m koh solution are needed to supply 0.125 mil of koh ?

Which of the following points is collinear with (-2,1) and (0,3)

The formula for the lateral area of a right cone is la = rs, where r is the radius of the base and s is the slant height of the cone.which are equivalent equations?