A Daniel has been asked to round 1.725 to one decimal place. His answer is 172.5
Explain Daniel's mistake.
B Nicole has rounded a number to one decimal place.
Her answer is 9.2
Write down 10 different possible numbers that she could have rounded.
C Dominic writes down two numbers, A and B.
A and B have 2 decimal places.
Dominic rounds A to 1 decimal place and calls his answer C.
He rounds B to 1 decimal place and calls his answer D.
Dominic says the difference between A and B cannot be the same as the
difference between C and D.
Show he is incorrect

- "runner b is moving at a slower rate."

- "the graphs shown are graphs of distance(km) against time(min).

the slopes of this graphs are are given by:

slope = (change in y)/(change in x)

= (change in distance)/(change in time)

this is the formula for finding the speed. so, the slope of these graphs represent the speed of the runner.

taking each division in the graph to represent 1 on both axis:

runner a ⇒ speed = (2-0)/(1-0)

= 2/1

= 2 km/min

runner b ⇒ speed = (3-0)/(3-0)

= 3/3

= 1 km/min

this shows that   runner b is moving at a slower rate."

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1^3 + 2^3 + 3^3 +4^3 = (1+2+3+4)^2

step-by-step explanation:

i am only able to answer the first part. i am not sure about the second part. sorry