The notation of a bar (vinculum, or overbar) over a whole number
doesn't seem to be very common. Here are some possibilities as to
what it could mean:
It is sometimes used as a grouping symbol, as in a fraction:
_____ __
3 + 1 x 5 = 20 so 67 = 67
I have also seen it used to refer to the average:
_ __
x = {1,2,6}, x = 3 so 67 = 67
(the average of one number is itself, of course).
I have also heard that it can be used to mean "1000 times whatever is
underneath", especially with Roman numerals - see the following Web
page, Final Answers by Gerard P. Michon:
Since she ran 6 times to complete a mile, each lap should be 1/6 of a mile. To run 5/6, she must run 5 laps. Your final answer should be 5. Hope this helps!
<h3>
Answer: AC = sqrt(21)/2</h3>
====================================================
Explanation:
Triangle CDA is congruent to triangle CDB. We can use the HL (hypotenuse leg) congruence theorem to prove this. This only works because we have two right triangles.
Since CDA and CDB are congruent, this means their corresponding pieces are the same length. Specifically AD = DB, so
AD+DB = AB
AD+AD = 3
2*AD = 3
AD = 3/2 = 1.5
For triangle CDA, we have AD = 3/2 = 1.5 and CD = sqrt(3). We can use the pythagorean theorem to find the missing side AC
a^2 + b^2 = c^2
(AD)^2 + (CD)^2 = (AC)^2
(3/2)^2 + (sqrt(3))^2 = (AC)^2
9/4 + 3 = (AC)^2
(AC)^2 = 9/4 + 3
(AC)^2 = 9/4 + 12/4
(AC)^2 = 21/4
AC = sqrt(21/4)
AC = sqrt(21)/sqrt(4)
AC = sqrt(21)/2
This is the same as writing (1/2)*sqrt(21) or 0.5*sqrt(21)
Answer:
y = -1x + 13
Step-by-step explanation:
y = -1x + b
5 = -1(8) + b
5 = -8 + b
13 = b
Answer:
0.29
Step-by-step explanation:
z-score is given by the formula:
z=(μ-M)/σ where
- μ is the hypothesis drive distance, which is 222
- M is the mean sample drive distance
- σ is the standard deviation of the sample drive distance
Therefore
z=(222-218)/14≈0.29
