Answer:
Mean=Sum of all values/number of observation
=3+2+4/3
=9/3
=3
Answer:
c=4v
8c+6v=152
Step-by-step explanation:
i did it on edge 2020
Solve:
<span>-X - Y - Z =-8
- 4X +4Y +5Z=7
2X + 2Z =4 is the same as x + z = 2. Thus, z = 2 - x.
Subst. 2 - x for z in the 1st and second equations.
</span>-X - Y - Z =-8 becomes -x - y - (2 -x) = -8
- 4X +4Y +5Z=7 becomes -4x + 4y + 5(2-x) = 7
Now we have 2 equations in only 2 unknowns. Let's simplify them!
-x - y - 2 + x = -8 which becomes -y = -6, or y = 6
-4x + 4y + 10 - 5x = 7 which becomes -9x + 4y = 7 - 10 = -3
Now substitute 6 for y in this last equation: -9x + 4(6) = -3, or
-9x + 24 = -3, or
-9x = - 27 => x = 3
Then x = 3, y = 6 and z = 2 - x, or z = 2-3, or z = -1.
The solution is (3, 6, -1). Check it!!
Answer:
The number of nickels, x is 4
The number of dimes, y is 16.
Explanation:
Given that Melanie has $1.80 worth of nickels and dimes, and she has 12 more nickels than dime.
Let x represent the number of nickels and y represent the number of dimes.
Then we have:
0.05x + 0.1y = 1.80 ...................................................(1)
x + 12 = y.....................................................................(2)
Solving these equations using graph as follow:
Note that the solution are the points where the lines intersect.
Here, x = 4 and y = 16