Answer:

Step-by-step explanation:
we know that
The total vertical distance (total miles North) traveled is equal to

Remember that


substitute


Answer:
The solution for given system of equations is: x = 6 and y = 3
Or
(6,3)
Step-by-step explanation:
Given equations are:

There are three methods to solve simultaneous equations
- Elimination
- Substitution
- Co-efficient method
We will use the elimination method as the coefficients of x in both equations are already same
Subtracting equation 2 from equation 1

Putting y = 3 in equation 2

Hence,
The solution for given system of equations is: x = 6 and y = 3
Or
(6,3)
Answer:
x = 2 or x = - 1/3
Step-by-step explanation:
3x² - 5x = 2
3x² - 5x - 2 = 0
(x - 2) (3x + 1) = 0
x = 2 or x = - 1/3
This is a fairly easy half-life problem
Each half-life reduces the radioactive material by one half.
So after 72 hours the radioactive material would have undergone 6 half-lives.
2^6 = 64.
So, there will be one sixty-fourth of the material left.
520 / 64 = 8.125 grams will remain.
radioactive decay is an exponential decay function.
Source:
http://www.1728.org/halflife.htm
7.67 is your answer. hope this helps, let me know if you need more help