Question 911019
<i>area A of a triangle is A equals 1 half b h</i>


That should be  A=(1/2)bh, if expressing in plain text; or will appear {{{A=(1/2)bh}}}, when the rendering tags are used.  The rendering tags are triple left curly brackets and triple right curly brackets.


You wanted to solve the formula for h.
{{{A=(1/2)bh}}}, given.
{{{A(2/1)(1/b)=h}}}, Multiplicative Inverse Property.
{{{highlight(2A/b=h)}}}, simplification, commutative property of multiplication included.


To find the answer to the last question, just substitute the given values and evaluate.