Answer:
This is a good tip and $18 is 18% of what the meal cost.
Step-by-step explanation:
On average the proper tip is 15% of the cost of your meal cost. In this case you have paid 18% of your meal cost.
There's nothing here to choose from but it should be something like : q + d = 18; .25q + .10d = 2.85
A hectare (ha) is the unit of area that can be used for that purpose.
It is roughly equivalent to 2.5 acres. It is equivalent in area to a square 100 m on a side. (10,000 m²).
Hello There!
1.0000 has 5 significant digits.
The zeros at the end of a decimal are significant.
Hope this helps you!
~Just a felicitous girlie
#HaveASplendidDay

Answer

Explanation
The formula to determine the area of a circle is 
Convert the diameter to radius
30/2 = 15
The radius is 15
Plug in the radius into the formula above

225 *
= approximately 