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)

The first floor of marcus’ house is 1,440 square feet. he will cover 1,033 square feet with wood and the rest with tile. a box of tiles will cover 11 square feet. how many boxes of tile does marcus need to buy to cover the floor?

Aprofessional hockey team has noticed that, over the past several seasons, as the number of wins increases, the total number of hot dogs sold at the concession stands increases. the hockey team concludes that winning makes people crave hot dogs. what is wrong with the hockey team's conclusion? a) it does not take into account the attendance during each season. b) it does not take into account the number of hamburgers sold during each season. c) it does not take into account the number of concession stands in the hockey arena. d) it does not take into account the number of seasons the hockey team has been in existence.

To convert celsius temperatures to fahrenheit, you can use the expression (c + 32). tom says that another way to write this expression is c + 32. what error did tom make?