<PRE><B>Question 23632</B>
all of your questions can be solved using the following formula
y2-y1
_____

x2-x1


use points for all the problems.  for problem 1  (0,18)and(10,27) are your points.  Time always goes in the x spot. the first set of points are set x1 and y1 and the second set are x2 and y2.  plug the numbers in the formula I gave and solve

27-18
-----
10-0

= 9/10

all are done the same way,  Including slope.  This is the formula for finding slope of a line and for finding rate of change when you have 2 points which you do in every question.  I will do one more for you, number 3

(1,30)(4,120)
120-30
------
4-1

=      90/3  =30</PRE>