16.
num = float(input("Enter a number: "))
if num >= 0:
print(num**0.5)
17.
num1 = float(input("Enter the first number: "))
num2 = float(input("Enter the second number: "))
operation = input("Which operation would you like to perform (a/s/m/d): ")
if operation == "a":
print("{} + {} = {}".format(num1, num2, num1+num2))
elif operation == "s":
print("{} - {} = {}".format(num1, num2, num1-num2))
elif operation == "m":
print("{} * {} = {}".format(num1, num2, num1*num2))
elif operation == "d":
print("{} / {} = {}".format(num1, num2, num1/num2))
18.
The answer is algorithm
19.
The correct answer is C
20.
We analyze algorithms to see which algorithm is the best fit for the job.
I hope this helps!