If the diameter of a circle is 9 cm, then its circumference is 56.52 cm.

true or false?

What is the value of x in the equation 1.5x+4-3=4.5(x-2)?

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?

Your car's gasoline tank holds 18 gallons of gasoline. on a trip in canada, the tank is one-quarter full. you want to fill the tank. how many liters of gasoline are needed to fill the tank