Answer:
A) 370
Explanation:
Circumference of a circle = pi x diameter
pi = 3.14
diameter = radius x 2
diameter = 10 x 2
diameter = 20
Circumference = 3.14 x 20
Circumference = 62.8 ft
I am not sure but i think you were to say this:(1st quality)x=( )(2nd quality)
Answer: OPTION B.
Step-by-step explanation:
By definition, the slope equals the Rise divided by the Run; then, the slope can be found using the following formula:

Where "Rise" is the vertical change between two points and "Run" is the horizontal change between those two points.
In this case you can identify in the figure that:

Knowing these values, you can substitute them into the formula.
Through this procedure you get that the slope of the ramp is:

Answer:
The population in 2015 will be 165 million.
Step-by-step explanation:
The exponential growth formula is given by:

Where:
a: is the initial population
r: is the rate of increase
Δt: is the time
With the initial information we can find the rate:
Using logarithm:
Using exponential:

Now, we can find the estimated population in 2015:
Therefore, the population in 2015 will be 165 million.
I hope it helps you!