Answer:
C) 3 sets of -2 tiles
Step-by-step explanation:
Its -2 three times, making it -6
If you multiply a positive and negative it is always negative
Answer:
The world population will be 11.64 billions in 21 years.
Step-by-step explanation:
Initial population = 8 billion
Growth rate = 1.8% per year =0.018
Time = 21 years
We are supposed to find what will the world population be in 21 years
Formula : 
y = population after t years
r = rate of interest in decimals
t = time in years
Substitute the values :


Hence the world population will be 11.64 billions in 21 years.
21 is nearly 25% of 80, so my estimate is 25%
Answer:
D
Step-by-step explanation:
When f(x) is equal to 0, x=4.