Answer:
x=11
AB=45
BC=73
Step-by-step explanation:
AB+BC=AC, so...
4x+1+7x-4=118
Combine like terms
11x-3=118
Solve for x
11x=118+3
11x=121
x=11
Now put x in each equation
AB=4x+1=4(11)+1=44+1=45
BC=7x-4+7(11)-4=77-4=73
AC=45+73=118 (which was given!)
9514 1404 393
Answer:
no
Step-by-step explanation:
The graph of this equation on an x-y plane is a vertical line. The input value x=15 maps to an infinite number of outputs (y-values). For a relation to be a function, each input can only map to one output.
x = 15 is not a function
Answer: 0
Step-by-step explanation:
Given that :
Mean score on test = 5
Standard deviation on test = 2
Distribution = normal
The mean value when Converted to a z - distribution :
Zscore = (x - mean) / standard deviation.
Hence z score for the mean score will be :
X = mean score
Zscore = ( 5 - 5) / 2
Zscore = 0 / 2
Zscore = 0
Mean value when Converted to a z distribution will be 0
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