Answer:
T-X
Step-by-step explanation:
Today=T
Yesterday = X
To find the diffrence you need to subtract Today from Yesterday then you will get your answer
9+3x^2
It's technically already in simplest form, except you usually put x first
=3x^2+9
$3.15 would be the cost, after the mark up is added.
The diameter is approximately 32.72 cm.
