Melody

it is just 58+85   

Look here

I really like how you have shown your working Geno.   

just put it straight into the calc like that only use round brackets, not the square ones.  :)

$${\mathtt{\pi}}{\mathtt{\,\times\,}}{\mathtt{5}}{\mathtt{\,\times\,}}{\mathtt{9}} = {\mathtt{141.371\: \!669\: \!411\: \!540\: \!695\: \!7}}$$

look here

$${{\mathtt{3}}}^{{\mathtt{8}}}$$

is entered as 3^8

 3494^2

do it on the calc on the home page

There is nothing that you can do

are they e as in 10^from the calculator

or 

This is what your teacher might mean. 

24+36=12*2+12*3=12(2+3)