Answer:
The second option
Step-by-step explanation:
x+y=29
5x+2y=100
then y=29–x
since 5x+2y=100
then 5x+2(29–x)=100
then 5x+58–2x=100
then 3x+58=100
then 3x=100–58
then 3x=42
then x=42/3
then x=14
then y=29–14=15
The answer should be d. 719
The answer you should have is c That should be able To help you My friend Message if I’m wrong and I’ll fix it for you
Y=Mx+b
Slope/M= -1
X= 3
Y= -1
-1 = -1(3)+b
-1 = -3 + b
Add +3 to -3 and -1 to cancel -3 out to get (b)
-3+3 = 0 cancel it
-1 +3 = 2
So, b = 2
In an equation it will be written as
y= -1x + 2
In standard form it will be
1x + y = 2
But your official answer will be
B= 2
Y= -1x+2
The standard deviation for the cost of mobile cell phones is 10.925.
Given
Mobile cell phone cost Number of students
10-19.99 7
20-29.99 20
30-39.99 28
40-49.99 12
50-59.99 7
We have to calculate the standard deviation of the given data.
Standard deviation is a measure which measures the variation in te values of data sets.
We know that the formula of calculating standard deviation is as under:
Standard deviation=
/
Mean=33.91392 (calculated in figure)
∑f
=8713.514 (calculated in image)
∑f-1=74-1=73
We have to now just put the values and find the value of standard deviation.
Standard deviation=
=
=10.925
Hence the standard deviation of mobile cost is 10.925.
Learn more about standard deviation at brainly.com/question/475676
#SPJ4