Melody

The total area under a normal curve is 1. 

So you need to know, or work out, the  relevant z scores for your question.

if you colour the bit of the curve that makes your question correct you can look up the z table table and work out the percent probability from that.

I haven't explained well, I know this.  If you give an exact question it might be easier.

On the web 2 calc you have to do it the long way

5 degrees 7 minutes and 8 seconds would be entered as  (5+7/60+8/3600)

Look at the topics in the sticky notes on the bottom right of your page.

Perhaps you are looking for the principal?

simple intrest what is the intrest for I=54 R=6% and t= 9months

I=Prt

54=P*0.06*9/12

$${\frac{{\mathtt{0.06}}{\mathtt{\,\times\,}}{\mathtt{9}}}{{\mathtt{12}}}} = {\frac{{\mathtt{9}}}{{\mathtt{200}}}} = {\mathtt{0.045}}$$

54=P*0.045

54/0.045 = P

$${\frac{{\mathtt{54}}}{{\mathtt{0.045}}}} = {\mathtt{1\,200}}$$

the principal would have been $1200

I think

PE = m*g*h

10 = 10*9.8*h

h = 1/9.8 

$${\frac{{\mathtt{1}}}{{\mathtt{9.8}}}} = {\frac{{\mathtt{5}}}{{\mathtt{49}}}} = {\mathtt{0.102\: \!040\: \!816\: \!326\: \!530\: \!6}}$$

I think that is 0.102 metres.   

(on Earth, at sea level)

Look in the sticky topics on the lower right side of your page.

One is on fractions and the calc

Geno, I do not get your answer.  

do you mean that they both can't threaten each other at the same time?  That is true. 

Assuming that there are no other peices in the way. And assuming that one is white and the other is black. 

If a bishop is on any square it will be threatened if the castle is on the same row or the same column.

There are 7 squares left on the column and 7 on the same row and there are a total of 8*8-1=63 squares that the bishop could be on so 

P(castle threatens bishop) =  $${\frac{{\mathtt{14}}}{{\mathtt{63}}}} = {\frac{{\mathtt{2}}}{{\mathtt{9}}}} = {\mathtt{0.222\: \!222\: \!222\: \!222\: \!222\: \!2}}$$

NOW

The probability that the bishop threatens the castle is more complicated.   

I think I shall think about it later.  LOL     

well it is not really y because there was no y in the question.

It just cannot be simplified    

0.1929 = 0.19    correct to 2 decimal places.   

$${\mathtt{5}}{\mathtt{\,-\,}}{\frac{{\mathtt{2}}}{{\mathtt{9}}}}{\mathtt{\,\times\,}}{\mathtt{5}} = {\frac{{\mathtt{35}}}{{\mathtt{9}}}} = {\mathtt{3.888\: \!888\: \!888\: \!888\: \!888\: \!9}}$$