Answer:
250,000 to 700,000 parts
Step-by-step explanation:
For the lower ratio of 0.5, we have to get 0.5 flouride parts/1 gallon of water equivalent to (some fluoride parts)/ (500,000 gallons of water). we can multiply 500,000 by 0.5 to get 250,000 as our lower limit. Similarly, we can multiply 500,000 by 1.4 to get 700,000 as our upper limit
Answer:91
Step-by-step explanation: 455 divided by .20 or .2 = 91.
we know that
If line b is perpendicular to line a, and line c is perpendicular to line a,
then
line b and line c are parallel
and two lines parallel have the same slope
so
Find the slope of the line b
Let
The formula to calculate the slope between two points is equal to
substitute
therefore
the answer is
the slope of the line c is
If two lines are perpendicular, then the product of the slope is -1.
Thus, the slope of line c is m which is the same as line b.
It is a system of an equation in which the highest power of the variable is always 1. A one-dimension figure that has no width. It is a combination of infinite points side by side.
Given
Line b is perpendicular to line a, and line c is perpendicular to line a.
To find
The slope of line c.
We know that the slope theorem
If two lines are perpendicular, then the product of the slope is -1.
Let the slope of line b be m, then the slope of line a will be .
Then
Then the slope of line c will be.
Then
Thus, the slope of line c is m which is the same as line b.
More about the linearsystem link is given below.