Enable text based alternatives for graph display and drawing entry

Try another version of this question

Evaluate the expression:

`a + 15 t`

When `a = -6` and `t = 12`


X
MathQuill
   x  x    n  |   | (   ) π DNE
   x    (   ) π DNE
( ) ( ] [ ) [ ] —∞ DNE
< > or All Real Numbers DNE
log logn ln n  | | e 
sin cos tan arcsin arccos arctan  
[more..]