ElectricPavlov

True, I did not include WEB2.0 calculator in my list...I just kinda forgot it, but it delivers 288 if you enter this question as written

48/2(9+3)

48/(2)(9+3)     Note the EXTRA parentheses     delivers   ' 2 '     ...with which I am OK.....kinda

Do not know what you are asking but

36kg / 30wk = 1.2 kg per week  = 2.65 pounds per week

Just use the division symbol for the numerator-denominator seperator.

1  Is there a decimal point in this 171 2 %   somewhere?  I will assume 17.12%

  17.12/100%  x £16.00  = £ 2.74 tax

2  100(1.1)(.9) =£ 99.00

THAT is a BIG increase:

6,000,000 / 120,000 x 100% = 5000 %  increase

The Quadratic FORMULA is used to find the solutions (A.K.A the 'roots' or the 'zeroes') of a Quadratic EQUATION of the form

ax^2 + bx +c = 0

The formula is

\(x = {-b \pm \sqrt{b^2-4ac} \over 2a}\)   

This is an old problem.....here is a good explanantion...but no clear answer as to which is "more correct"

https://math.berkeley.edu/~gbergman/misc/numbers/ord_ops.html

I think we should aim for UNambiguity in ALL of our calcs....wouldn't want to be launching in to space with ambiguous calculations used by the engineers !!!

No one said anything about them being simultaneously in the numerator and denominar.....(9+2) is only in the numerator....

I guess we will just agree to disagree....but go to this website and enter the equation as written:

https://www.cymath.com/answer.php?q=48%2F2(9%2B3)

or this one

https://www.wolframalpha.com/

or this one

http://www.quickmath.com/webMathematica3/quickmath/equations/solve/basic.jsp

or this one

http://www.homeschoolmath.net/worksheets/equation_calculator.php

That would be 10^23      H2  MOLECULES  (if they were in free molecular form...which they aren't)

As Asinus has shown,   E  means  'exponent'   and will often be seen when using various calculators, particularly if in "scientific notation' mode. .