40% of 85 is 34 so 85-34=51
51 is your answer
Answer:
<u><em>Negative Correlation</em></u>
The variable x - value increases as y- value decreases is called negative correlation.
Step-by-step explanation:
<u><em>Explanation</em></u>:-
Negative correlation:-
The negative correlation is a relation between two variables such that they are part of a function in which depends and independent variables move in different directions in terms of value.
<u><em>Positive correlation</em></u>
The variable x - value increases as y- value increases is called positive correlation.
<u><em>Negative Correlation</em></u>
The variable x - value increases as y- value decreases is called negative correlation.
<u><em>No correlation </em></u>
There is no pattern between two variables
there is no connect between two variables is called No - correlation
I'm not sure if it only wants you to find Equation 1 or go further and solve:
x = the number of 5c coins
y = the number of 10c coins
Equation 1: the total number of coins is 65
x + y = 65
total value of $3.80
0.05x + 0.1y = 3.8
<u>Simultaneous Equations</u>
Make one coefficient the same
10 * (0.05x + 0.1y = 3.80 = 0.5x + y = 38
x + y = 65
0.5x + y = 38
Subtract the equations
(x + y) - (0.5x + y)= 65 - 38
(x - 0.5x) + (y - y) = 65 - 38
0.5x = 27
x = 54
Substitute it into the original equation to find y.
x + y = 65
54 + y = 56
y = 65 - 54 = 11
Substitute it into the other equation to check it's right.
0.05x + 0.1y = 3.8
0.05(54) + 0.1(65) = 3.8
x = 54 5c coins
y = 11 10c coins
256.5/18= 14.25
(14.25x2)+(18x2)= 64.5m
