Melody

1/40C6

3838380 = 3.83838e6

1/3838383

2527\100 = 25.27

Use the subscript button in the ribbon.

If you use 4/3 of a tin for each door that is more than one whole tin.

They must be BIG doors.

4/3*7= = 9.3333333333333333

So 10 cans will be needed.

Yes you are correct pro35.  You are also extremely rude.

You will not win any friends here by being so incredibly rude!

Max:  Here is one I can teach to you,

you showed

If you want to make summation sign, do \sum_{lower limit}^{upper limit} (For infinity sign, do \infty)

Example: Latex code:\sum_{n=1}^{\infty}                \(\sum_{n=1}^{\infty} \)

This is how I would do it:

\displaystyle \sum_{lower limit}^{upper limit} (For infinity sign, do \infty)

\(\displaystyle \sum_{n=1}^{\infty} \)

Thanks Max and asinus, it is good for people to see how LaTex can be used.  :)

I had vaguely wondered about this one      180^{\circ}

I have always used  180^0  but yours is better max    

I will have to try and remember it :)

A=9B

A+B=180

so

9B+B=180

and you can finish it :)

Find the sum of all possible positive integer values of b such that the quadratic equation 2x^2 + 5x + b = 0  has rational roots.

This will have rational roots when

\(25-4*2*b\ge 0\\ 25-8b\ge0\\ -8b\ge-25\\ 8b\le25\\ b\le 3\frac{1}{8} \)

b has to be a positive integer - according to the question so

b can equal 1,2,or 3

1+2+3 = 6

Hi guests - I am not sure if you are the same guest or 2 different guests but I iwll take a look. 

This is a very poorly worded question. !!

fuel cost involved in idling your car for 5 minutes per day when the cost of gasoline is $3.75(per gallon) using formula c=19a-4 where c is the cost (I will assume this is in cents) and a is the size of the engine in liters. Determine the size of the engine in your car and find the cost of idling your car for 5 minutes a day. cost of gasoline is $3.75(per gallon) and engine size is 4.0 liters

C = 19a - 4

C is total cost - not the cost of per gallon

a=4

C=19*4 - 4

C = 76 -4

C = 72 cents

so yes guest - you interpreted the question the same as I did but really the question did not make sense.  :)