In a chemistry course with two exams and a final, receiving 90-100% of the total points receives an A; 80-90% a B; 70-80% a C; 60- 70% a D; and below 60% an F. A student scores an 89 / 100 on the first exam, 81/100 on the second exam, and 160/200 on the third
exam. What letter grade will the student receive?
Select one:

Mercury metal is poured into a graduated cylinder that holds exactly 22.5 ml the mercury used to fill the cylinder mass in 306.0 g from this information calculate the density of mercury

Is this correct if not can u correct me

To find the work done, the force exerted and distance moved are multiplied. a couch is moved twice before you are happy with its placement. the same force was used to move the couch both times. if more work is done the first time it is moved, what do you know about the distance it was moved? a) when more work was done, the couch was moved the same distance. b) when more work was done, the couch was moved less. c) when more work was done, the couch was moved further. d) when more work was done, the couch wasn't moved at all.