Answer:
7x^2-x-14
Step-by-step explanation:
Answer:


And the mean would be:

And the standard deviation of total time would be:


Step-by-step explanation:
Previous concepts
Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".
The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".
Solution to the problem
Let total life time of t four transistors T = X1 + X2 + X3 + X4 (where X1,X2,X3 and X4 are life time of individual transistors
For this case the mean length of time that four transistors will last


And the mean would be:

And the standard deviation of total time would be:


Answer:
x = 0.8
Step-by-step explanation:
2/3 = 1.2/x
First, flip the equation (personal preference)
1.2/x = 2/3
Multiply by 1.2 to isolate the variable.
x = 1.2 * 2/3
x = 0.8
Answer:
A Rational Number can be made by dividing two integers
The cordinate plane can be used to plot points and graph lines
Answer:
Part A: A(m(t)) = π(81t²); Part B: 1017.36
Step by step explanation:
Part A:
To find A(m(t)), we substitute our value for m(t), 9t, in place of m:
A(m(t)) = πm² = π(9t)² = π(81t²)
A(m(t)) = π(81t²)
Part B:
Substitute 2 in for t:
A(m(2)) = π(81(2²)) = π(81(4)) = 3.14(324) = 1017.36