Answer:
after tax is added the price would be 3.13$
Step-by-step explanation:
Set the formula up and insert the stuff
=16.56 if you use the A=PIr^2
Answer:
The base is 4cm and the height is 5cm.
Step-by-step explanation:
This is a solve the system question. Call H the height of the triangle and B the base. The question tells us:

and

Sub the first equation into the second (as H is already isolated). You will end up with a quadratic equation - solve that any way you wish (e.g. quadratic formula). I've provided the factored form below which shows you the roots:

In this question, we take B=4. You can't have a negative side length so the other answer is eliminated. Now sub the value for B into either of the original equations. I'll use the first, again because H is already isolated:

1.C 2.B 3.B&C No shape shown for number 4 otherwise I would be of more help.
25 for the first one
(-5-2=-7 -7x-3=21 21+4=25)
220 for the second one
(10x-2=-20 -20+(-2)=-22 -22x-10=220)