Answer:
Correct. The last one
Step-by-step explanation:
Answer:-2
Step-by-step explanation:
Answer:
<em>The number is 46</em>
Step-by-step explanation:
<u>Equations</u>
Suppose:
a = One digit of the number
b = Tens digit of the number
The sum of the digits is 10:
a + b = 10
The number expressed as two-digits quantity is ab, and its value is
10a+b
When we add 18 to that number, we have:
10a+b+18
And that is represented as the number reversed:
10a+b+18=10b+a
Simplifying:
9a+18=9b
Dividing by 9:
a + 2 = b
Substituting in the first equation:
a + a + 2 = 10
2a = 8
a = 4
b = a + 2 = 6
Thus the number is 46
Answer:
0.67
Step-by-step explanation:
z = (x-μ)/σ, where
x is the raw score = 5.6 seconds
μ is the population mean = 5.2 seconds
σ is the population standard deviation = 0.3 seconds
z = 5.6 - 5.2/0.3
z = 0.66667
z score is approximately 0.67
The z-score for a player who runs a time of 5.6 seconds is 0.67
