Answer: 4 - 5 = 4 + (-5) = -1
Step-by-step explanation: You have to make the 5 into a negative number using parenthesis and do the math.
Answer:
is it an abc or what??
Step-by-step explanation:
Answer:
where am i supposed to find the x if you haven't given the equation for the sum
Step-by-step explanation:
Let cost of 1 box of red pen = x
Let cost of 1 box of black pen = y
Gaga bought 5 red box and her sister 4 black box then total cost is given by
5x+4y
Given that total cost was $44
so equation will be 5x+4y=44...(i)
After exchange
Gaga= 4 red box + 1 Black box
Sister = 1 red box + 3 Black box
then cost for Gaga = 4x+1y
cost for sister = 1x+3y
Given that cost for both after exchange is same so we get
4x+1y = 1x+3y
or 4x-1x = 3y-1y
or 3x = 2y
or 3x/2=y ...(ii)
plug (ii) into (i)
5x+4y=44
5x+4(3x/2)=44
5x+12x/2=44
5x+6x=44
11x=44
x=4
Now plug value of x into (ii)
y=3x/2=3*4/2=12/2=6
Hence cost of 1 box of red pen = $4
And cost of 1 box of black pen = $6
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If you want to get solution without solving both equations then just graph both equations and find the intersection point.
You will see that graph intersect at (4,6) which gives x=4, y=6
Answer: D. two-sample z-test for a difference in population proportions
Step-by-step explanation:
The options for the given questions were missing. The options are as follows:
A one-sample z-test for a sample proportion
B one-sample z-test for a population proportion
A
C two-sample z-test for a difference in sample proportions
D two-sample z-test for a difference in population proportions
Solution:
Sample proportions are used to estimate population proportions.
We are given the sample proportion of students from one state who ordered a yearbook = 70/150
We are also given the sample proportion of students from the other state who ordered a yearbook = 65/100
Since there are 2 samples and we want to investigate if there is a difference between 2 population of students,
Therefore, the most appropriate method for analyzing the results is
D. two-sample z-test for a difference in population proportions
