What comes into your mind when you rear the word matter?

Found a 1997 silver in color penny that has the same exact markings as a regular penny and weighs the exact same as a regular penny what do I have and how much is it worth? What is the soultion to x2 plus 10x plus 1 equals -12 plus 2x? What number is irrational? What is a shape called in mathematics? How long is a 100 feet in inches? What is the abstract noun for accrue? Is the formula diameter equals 4 x r correct? What is the nth term of 13579? What represents trustworthy? How do you draw a rhombus with sides of 5cm and two of its angles equal to 50 degrees? Which mixed number is greater than 6.78? How many milimiters are in an inch? What numbers can make up a square up to a 100? How do you convert 0.781 m to cm? How many milligrams equals 65 grams? What is the digit and value of 5? What is Q - 8 plus 2 if Q equals 2? What is the surface area of a right pyramid with height 12 mm whose base is a 10 mm by 18 mm rectangle? What is the side of your butt called? What is the circle with the 5 sided star in the middle called?