Answer:c
Step-by-step explanation:
There are 1000 Times more people on earth right now than there was in 4,000 BCE. It's just 7billion divided by 7million.
Answer:
13 seconds.
Step-by-step explanation:
Given

Required
Determine a reasonable solution for t
To do this, we equate h to 0.
becomes

Divide through by -4.9

Reorder the expression

Split
or 
This gives:
or 
But time can't be negative, So:

Answer:
A = 360
B= 180
C=270
Step-by-step explanation: