Maths questions? please help!

  • 0 votes

There are two questions I dont understand so far...

"explain why 2^5 x 3^4 is not a perfect square"

and

"Find the value of the reciprocal of 0.7"

Thank You:)

Posted Sun 10th June, 2012 @ 15:27 by AmyPond

6 Answers

  • 0 votes

I'm not sure about the first one, sorry!

But the second one I can do...

0.7=7/10 the reciprocal of this is 10/7 

Answered Sun 10th June, 2012 @ 15:35 by Dilly
  • 0 votes

I think I know how the first one works.

2^5 = 2 x 2 x 2 x 2 x 2

and 3^4 = 3 x 3 x 3 x 3

so 2^5 = 32 and 3^4 = 81

In the case of making a square, 2^5 would be the length of one side, and 3^4 would be the length of another. Together they would make the length and width of a square (which is which is not relevant)

So a perfect square would have the same length and width. E.g. width of 2 and length of 2 (2 x 2). If one side was longer/shorter than the other (E.g. 2 x 3), it would be a rectangle.

2^5 (32) and 3^4 (81) are not the same. Therefore, the lengths of the sides are different and the square cannot be perfect. :)

Answered Sun 10th June, 2012 @ 15:43 by Devon Lauren Dalton
  • 0 votes

Thank you- that makes sense now!:)

Answered Sun 10th June, 2012 @ 15:49 by AmyPond
  • 0 votes

can someone help me with this question you might find it easy as its from the foundation paper the diagram shows a man and a bus the man and the bus are drawn to the same scale the man is of average hight

write down an estimate for the height of the man

find an estimate for the length of the bus

Answered Sun 10th June, 2012 @ 16:34 by RajaK
  • 0 votes

Its hard to do without seeing a scale or image but the average height of a man is somewhere around 5ft 9 inches

Then to find the length of the bus you need to look logically. Aproximatley how many men would fit along the length of the bus?

Answered Sun 10th June, 2012 @ 17:07 by Katie
  • 0 votes

http://www.bland.in/GCSE%20Maths/maths1.nov11.pdf hey thats the link for the past paper its question 6 :)

Answered Sun 10th June, 2012 @ 17:18 by RajaK