A car moves from rest. The graph gives information about the speed, v metres per second,
of the car t seconds after it starts to move.
251
(i) Calculate an estimate
of the gradient of the
graph at t = 25
Give your answer as
a decimal.
(3)
20-
15
Speed (m/s)
10
(ii) Which one of the
following does your
answer to part (1)
represent?
(1)
A rate of change
B m/s/s
C increase in speed
D acceleration
40
Total marks:
5
o
5
10
15
30
35
20 25
Time (seconds)

X+ y = k 2x + 3y = k + 1 the point of intersection of the lines has an x-coordinate of a.2k + 1 b.-2k + 1 c.2k - 1

Quick! a survey of 57 customers was taken at a bookstore regarding the types of books purchased. the survey found that 33 customers purchased mysteries, 25 purchased science fiction, 18 purchased romance novels, 12 purchased mysteries and science fiction, 9 purchased mysteries and romance novels, 6 purchased science fiction and romance novels, and 2 purchased all three types of books. a) how many of the customers surveyed purchased only mysteries? b) how many purchased mysteries and science fiction, but not romance novels? c) how many purchased mysteries or science fiction? d) how many purchased mysteries or science fiction, but not romance novels? e) how many purchased exactly two types of books?

What is the slope of the line shown below?