Answer:
her brother is 9
Step-by-step explanation:
21-3=18 18 divided by 2 = 9
[Rewritten and Fixed]
Joint relative frequency is the ratio of the frequency in a certain category and the total number of data points in that category.
Your answer would be A b=a+5
The solution to the system of equation is (3/2, -1/2)
<h3>System of equations</h3>
Given the following system of equations as shown;
(3x+y=4 .... * 4
2x-4y=5 ..... * 1
_______________
12x+4y=16
2x-4y=5
Add both equations
12x+2x = 16 + 5
14x = 21
x = 3/2
Substitute x = 3/2 into any of the equation to have;
2x-4y=5
2(3/2) - 4y = 5
3 - 4y = 5
-4y = 5 - 3
-4y = 2
y = -1/2
Hence the solution to the system of equation is (3/2, -1/2)
Learn more on system of equation here: brainly.com/question/25976025
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