Step-by-step explanation:
area of a circle
A = pi x r^2
r=9
1/1.5 * 10^-6 = 2500/x
x = 1.5 * 10^-6 * 2500
x = 0.00375 or 3.75 * 10^-3 second.
Answer:

Step-by-step explanation:

0.00067
You always want the period to the right of the first number meaning you’ll start from there counting backwards because it is negative.
Answer: Monday had the lowest temp below zero, on Monday and Tuesday the temp was below zero.
Step-by-step explanation: I did it