$${\frac{{\mathtt{green}}}{{\mathtt{brown}}}} = {\mathtt{u}}$$

pIZZA 

$${\mathtt{975\,629\,356\,237}}{\mathtt{\,\times\,}}{\mathtt{8\,715\,473}} = {\mathtt{8\,503\,071\,312\,290\,955\,101}}$$

$${\mathtt{38.72}}{\mathtt{\,\times\,}}{\mathtt{0.25}} = {\frac{{\mathtt{242}}}{{\mathtt{25}}}} = {\mathtt{9.68}}$$

That is the additional 25%  you just add it to the beginning price

38.72+9.68=48.40

The total cost is $48.40

We can make an equation/  13/a=0.5

a is the mysterious number you need to find.

0.5 also equals 1/2

So you need to find something that will make 1/2

13/26=0.5

So 26 is your mystery number

how's the third grade going?

too much tbh

u dont sry

4 b***s......because 'to' isn't a number

(17-2)=15                             (4+6)=10                      so 10*15=150/2=75

Thanks Alan.

I misinterpreted the question 😦

If the result of your calculation with pi is usd in another calculation and that is used in another calculation and that is used in yet another calculation ... etc. rounding errors can build up rapidly, possibly leading to a nonsensical final answer.

Of course, you rarely come across this problem in school level calculations, but in real, industrial, engineering design calculations, for example, this can often be the case.  More digits of pi (and other constants and variables) then need to be carried through the calculations so that rounding errors are kept very small.

.

Both 3/8 and 2/3 share a common denominator of 24,  in which 3/8 is 9/24 and 2/3 is 16/24.  They share other common denominators,  but the least is 24

Hi Melody,

i thank you very much.  Sorry i  can't  Insert pictures. I don't know why.

bye.

Hold up a sec.......engradepro is my online gradebook

Now Heureka says that AH=HB  

This certainly looks right but at present I can't see how to prove it.

Given that AH = r/2, AD = r and DB = 2r  where r is the radius, then HB = DB - AH - AD = 2r - r/2 - r  = r/2 = AH

.

6 is a number it is before 7 but after 5.

I was just looking at what Heureka was saying.  It took me a while to work it out.

                                                   B

This is the triangle that Heureka was describing

The radius that bisects the chord is perpendicular to the chord so <AHE=90 degrees

which means <AEH=30 degrees (Angle sum of a triangle)

Using trig I know that AH=0.5*AE=2.25  but I am not allowed to use trig.  

Now Heureka says that AH=HB  

Edited: that is because AB is one radius and AH is 1/2 radius so  HB must also be a 1.2 radius 

Join EB forming a new triangle HEB

Now triangle HEB is congruent to triangle HEA because all the angles are congruent and they have a common corresponding side.

therefore triangle AEB is equilateral  and HA=HB

therefore all the sides are  4.5 inches

therefore HA=HB=2.25 inches

 $$\\x^2=4.5^2-2.25^2\\
x^2=20.25-5.0625\\
x^2=15.1875\\
x^2=151875/10000\\
x=\sqrt{151875/10000}\\
x=\sqrt{25*25*81*3/10000}\\
x=(25*9/100)\sqrt{3}\\
x=(2.25)\sqrt{3}\\
side = 4.5\sqrt{3}\;\;inches$$

Thanks Heureka 

Example: A medicine is made by disolving 2 grams of powder in 500 grams of water. What percentage is that concentration?  

1,4,10,28,?,244

$$3^n + 1 - \left\{ \
\dfrac{ 1- \left[\
1 \mod (n+1) \right \ ]
} {n+1}\ \right\}$$

You mean that you get 1c on the first day,2c on the second day,4c on the 3rd day,...... for 30days?

This is the sum of a GP    a=1, r=2, n=30

$$\\\boxed{S_n=\frac{a(r^n-1)}{r-1}}\\\\
S_{30}=\frac{1(2^{30}-1)}{2-1}\\\\
S_{30}=(2^{30}-1)$$

$${{\mathtt{2}}}^{{\mathtt{30}}}{\mathtt{\,-\,}}{\mathtt{1}} = {\mathtt{1\,073\,741\,823}}$$  cents

$10,737,418.23     Not bad for a months pocket money