Answer:
third option (7.5, 8)
this option (6, 5, -3)
Step-by-step explanation:
you eliminate one variant by expressing it through the other(s) until you have one equation with one variable.
that you solve, and then you go back to the other elimination expressions to calculate the others.
2x - y = 7
-2x + 3y = 9
since the terms with x are already so similar, we could now simply add both equations and solve that result :
2x + (-2x) -y + 3y = 7+9 = 16
0×x + 2y = 16
2y = 16
y = 8
=>
2x - 8 = 7
2x = 15
x = 7.5
x - 2y - 3z = 5
x + 2y + 3z = 7
x + z = 3
the same trick by adding the first 2 equations
x + x -2y + 2y -3z + 3z = 5 + 7 = 12
2x + 0y + 0z = 12
2x = 12
x = 6
=>
6 + z = 3
z = -3
and then
6 + 2y + 3(-3) = 7
6 + 2y - 9 = 7
2y - 3 = 7
2y = 10
y = 5
Answer:
38
Step-by-step explanation:
(f°g)(5)=f(g(5)
(f°g)(5)=f(5^2-5*3)
(f°g)(5)=f(10)
(f°g)(5)=4(10)-2
(f°g)(5)=38
Well, you already have the decay model, so just plug that in
Answer:
Standard error for the proportion of social media users who are concerned about privacy
S.E = 0.0219
Step-by-step explanation:
<u><em>Explanation:</em></u>-
Given data recent survey of 500 social media users, 300 stated that they were concerned about privacy
<em>Size of random sample 'n' = 500</em>
<em> x = 300</em>
<em>sample proportion </em>
<em></em>
Standard error for the proportion of social media users who are concerned about privacy is determined by
<em></em>
<em> </em>
<em></em>
