For #4, you need to know the volume of a sphere, or half of one.

The volume of a sphere is about 52% of the cube it just fits into.

I would have thought it was more like 70%, but I was wrong

well if youre allowed a calculator, you can calculate 4 as

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The volume of a sphere is about 52% of the cube it just fits into.

I would have thought it was more like 70%, but I was wrong ]]>

And I have put down some of what we tackled here on this page: Scientific Notation

]]>SORRY!!!

]]>Example: 125. would be written as 1.25 × 10[sup]2[/sup]

Just think "how many places do I move the decimal point?" in this case it moved by 2 places.

So:

a) 148 200*2 531 000*583.2 = 218754937440000. = 2.18754937440000 × 10[sup]14[/sup]

2) to calculate the volume of a cuboid just multiply width by height by length. I will do this using standard form as I go:

0.000 002 56m = 2.56×10[sup]-6[/sup]

0.000 000 14m = 1.4×10[sup]-7[/sup]

0.000 275m = 2.75×10[sup]-4[/sup]

To multiply them together. you can just multiply the "digits" parts together, and then work out the powers of 10 by adding them, like this:

2.56×10[sup]-6[/sup] × 1.4×10[sup]-7[/sup] × 2.75×10[sup]-4[/sup] =

2.56×1.4×2.75 × 10[sup]-6[/sup]×10[sup]-7[/sup]×10[sup]-4[/sup] = 9.856×10[sup]-17[/sup]

(to work out the "-17", I just added the "-6", "-7" and "-4")

]]>1) in each of the following calculations, give your answer in STANDARD FROM TO FOUR SIGNIFICANT FIGURES.

a)148 200*2 531 000*583.2

b)0.0000731*0.0002859*0.03756

c)5.9*18.6*291.7

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515 284

d)3.65*258

thanks i know you must think in thick thanks for helping though.

2)calculate the volume of a cuboid, giving your answwer in STANDARD FORM TO FOUR DECIMAL PLACES.

THE BACK, SIDE LINE IS 0.000 002 56m

THE FRONT SIDE LINE IS 0.000 000 14m

THE BOTTOM LINE IS 0.000 275m

3)the staff car park at a hospital is cirular and of area 715 square metres. how far is it across the car park TO THE NEAREST METRE.?

4)a storage container is in the shape of a hemisphere. it can contain 550 cubic metres of liquid when it is full.

how far is it across the ontainer TO ONE DECIMAL PLACE.

thanks again for this help.

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