Thread: Can someone tell me where I have gone wrong the answer is ment to be 3.89

Cant seem to get 3.89
15.4+(a*5.6)-(11.8/2.5)+3(2+1.1)=34.67
15.4+(a*5.6)-(4.72)+(9.3)=34.67
15.4+(a*5.6)+4.58=34.67
(a+5.6)+19.98=34.67
a=(34.67-19.98)/5.6
a=2.623
Could someone also inform me what everyone uses to write the math on the forum?
Cheers

Its hard to say what went wrong without the question. As for your expression indeed evaluates to a = 2.623

The math language is called latex.
LaTex Tutorial

Originally Posted by Bairdy13

15.4+(a*5.6)-(11.8/2.5)+3(2+1.1)=34.67

Save steps and headaches; start this way:
5.6a = 34.67 - 15.4 + (11.8/2.5) - 3(2+1.1)

Apologies the question was transpose and find the unknown term. (a)
15.4+(a*5.6)-(11.8/2.5)+3(2+1.1)=34.67 is how it is written in the book and their answer is 3.89

So on the left you have 5.6a+ (15.4- 11.8/2.5+ 3(2+ 1.1))= 5.6a+ (15.4- 4.72+ 3(3.1))= 5.6a+ (10.68+ 9.3)= 5.6a+ 19.98 and on the right 34.67: 5.6a+ 19.98= 34.67. Subtract 19.98 from both sides: 5.6a= 34.67- 19.98= 14.69. Now divide both sides by 5.6:
a= 14.69/5.6= 2.6232..., NOT 3.89.

Thank you. As I thought. It seems there may be a few wrong answers in this basic math review sheet.