A rock is tossed off a balcony. Its height (in feet) is given by the formula h
(
t
)
=
−
16
t
2
+
7.7
t
+
130
, where
t
is measured in seconds.
How long will it take the rock to hit the ground?

James was playing a game with his friends. he won 35 points. then he lost 15, lost 40 and won 55. how did he come out

The number of 8th graders who responded to a poll of 6th grade and 8 th graders was one fourtg of the number of 6th graders whi responded if a total of 100 students responddd to the poll how many of the students responded were 6 th graders

The line plot below represents the number of letters written to overseas pen pals by the students at the waverly middle school.each x represents 10 students. how many students wrote more than 6 and fewer than 20 letters. a.250 b.240 c.230 d.220