Melody

Draw the triangle.  Cut it in half so that you have the perpendicular height in the middle

Now one side of it is a right angled triangle.

The hypotenuse is 19cm

the base is 19/2 = 9.5 cm

now use pythagoras' theory to find the height.

Huh

I think you got confused anon

5+10=15

so the chance of it being a CD is 5/15    or    1/3

You will pick a red half the time  That is 50% of the time.   :)

20/100 * 50

now use a calculator.:)

There is a calulator on the home page.  USE IT

FOR THE ESTIMATION PART YOU CAN ESTIMATE PI AT 3

First a nickel is 5c and a dime is 1c    (I think    )

NOPE: Geno has just corrected me a dime is 10c thanks Geno.

just go through the answers methodically

5 dimes and 1 nickel

4 dimes and 3 nickels

etc

$$\\\frac{r}{2}\ge-2\\\\
r\ge-4\\\\$$

Hi Vivain,

There are 12 inches in a foot 

A negative and a subtract  is the same thing.  Use the subtract button

This is your problem so you need to find an answer that works for you