Which part of the quadratic formula tells you whether the quadratic equation can be solved by factoring? −b, b2 − 4ac, 2a Use th
1 answer:
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Step-by-step explanation:
1) The area of rectangle is ( 30x²y + 20xy ) cm² and its breadth is 10xy cm .Find its length....
= Solution ,
Length ( L ) = ?
breadth ( b ) = 10xy cm
area ( a ) = ( 30x² + 20xy )
Now ,
area ( a ) = l × b
or, ( 30x²y + 20xy ) = L × 10xy cm
2) Subtract the quotient when 20x⁴y² is divided by 5x³y from the product of 2x and 3y.
= Solution,
The product of 3x and 4y = 6xy
= 6x - 4xy
hope it helped !!!!
Answer:
Approximately (or equivalently
,) assuming that whether each resident owns boats is independent from one another.
Step-by-step explanation:
Assume that whether each resident of this town owns boats is independent from one another. It would be possible to model whether each of the selected residents owns boats as a Bernoulli random variable: for
,
.
means that the
th resident in this sample does not own boats. On the other hand,
means that this resident owns boats. Therefore, the sum
would represent the number of residents in this sample that own boats.
Each of these random variables are all independent from one another. The mean of each
would be
, whereas the variance of each
would be
.
The sample size of is a rather large number. Besides, all these samples share the same probability distribution. Apply the Central Limit Theorem. By this theorem, the sum
would approximately follow a normal distribution with:
- mean
, and
- variance
.
of that sample of
residents would correspond to
residents. Calculate the
-score corresponding to a sum of
:
.
The question is (equivalently) asking for . That is equal to
. However, some
-tables list only probabilities like
. Hence, convert
to that form:
.
Look up the value of on a
-table:
.
Therefore:
.