3x+2y= -8
multiply by 3 to,x-y= -1
so u will get,
3x+2y= -8
-3x+3y=+3,eliminating both of them you will get,
5y= -5
y = -1
by applying the value of y,
3x+2*-1= -8
3x - 2= -8
3x= -5
x = -5/3
By evaluating the linear function in x = 7 we conclude that:
<em>"The value of f(7) is 6.50, and it represents $6.50 remaining after playing 7 songs."</em>
<h3>
</h3><h3>
Which statement about f(7) is true?</h3>
Here we have the linear function f(x)= 10 - 0.5*x, it represents the amount of money remaining after x songs are played on the jukebox.
Then, that function evaluated in 7 is:
f(7) = 10 - 0.5*7 = 10 - 3.5 = 6.5
This means that after you play 7 songs, the amount of money remaining is $6.5
From this we can see that the correct option is:
<em>"The value of f(7) is 6.50, and it represents $6.50 remaining after playing 7 songs."</em>
If you want to learn more about linear equations:
brainly.com/question/1884491
#SPJ1
7(x-3) = 4(x+5)
7x - 21 = 4x + 20
7x - 4x = 20 + 21
3x = 41
x = 41/3
x = 13.67
Answer: a. 170 b. 752
Step-by-step explanation:
The formula to find the sample size is given by :-
, where p is the prior estimate of population proportion.
= Two-tailed z-value for (significance level).
E= Margin of error .
Given : Margin of error = 0.03
Confidence level = 90%=0.90
By z-value table :
a) The president's political advisors estimated the proportion supporting the current policy to be : p= 0.06.
Required sample size :
∴ Required sample size = 170
b) If no prior estimate of population proportion is given , then we assume
p= 0.5
Required sample size :
∴ Required sample size = 752
Answer:
16
Step-by-step explanation:
6 divided by 3/8=6*8/3=48/3=16