Yes, -9 can be written as a fraction over 1, meaning it is a rational number

Answer:
In basic mathematics, pi is used to find the area and circumference of a circle. Pi is used to find area by multiplying the radius squared times pi. So, in trying to find the area of a circle with a radius of 3 centimeters, π32 = 28.27 cm.
Answer:
16/21
Step-by-step explanation:
8 because it goes from 1s 10s 100s so 8 is the answer