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2 years ago

Help, i was out sick for most of the week before and didnt learn this materal, i really need help

Mathematics

1 answer:

Dafna1 [17]2 years ago

3 0

Answer:

example 1 is correct

a^2 - b^2 factors as (a+b)(a-b)

that is a form that math teachers want you to memorize

it is called the "difference of squares" factoring

Step-by-step explanation:

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John spent about 12 hours at a water park. He estimated he spent about 40% of the time waiting in line. What would be a reasonab

White raven [17]

40% of 12 hours would be 4.8 hours

4 0

2 years ago

HELPPP I NEED THE ANSWER FAST PLEASEEE Shirley is buying a $27 scarf. If the sales tax is 7.25% and she hands the cashier $30, h

Elodia [21]

Hi, I think the answer should be $4.26

7.25% × $24 = $1.74

$24 +1.74 = $25.74

Change is the difference between the amount tendered and this total amount:

$30.00 -25.74 = $4.26

6 0

2 years ago

Read 2 more answers

PLS HELP <br> NO LINKS OR I WILL REPORT <br> WILL MARK BRAINLIEST

Zanzabum

1. 10 pastries
2. $11
3. 5 miles
4. 0.83 cups
5. 9 pizzas

1. $0.41
2. erik because there is more

3 0

2 years ago

If a procedure meets all of the conditions of a binomial distribution except the number of trials is not fixed, then the geomet

morpeh [17]

Answer:

The probability is 0.0428

Step-by-step explanation:

First, let's remember that the binomial distribution is given by the formula:

$P(X=k) =\left[\begin{array}{ccc}n\\k\end{array}\right] p^{k}(1-p)^{n-k}$ where k is the number of successes in n trials and p is the probability of success.

However, the problem tells us that when there isn't a number of trials fixed, we can use the geometric distribution and the formula for getting the first success on the xth trial becomes:

$P(X=x) = p(1-p)^{x-1}\\$

The problem asks us to find the probability of the first success on the 4th trial (given that the first subject to be a universal blood donor will be the fourth person selected)

Using this formula with the parameters given, we have:

p = 0.05

x = 4

Substituting these parameters in the formula and solving it, we get:

$P(X=4) = 0.05(1-0.05)^{4-1}\\P(X=4) = 0.05 (0.95)^{3}\\P(X=4) = 0.05(.8573)\\P(X=4) = 0.0428$

Therefore, the probability that the first subject to be a universal blood donor is the fourth person selected is 0.0428 or 4.28%

7 0

3 years ago

Differentiating a Logarithmic Function In Exercise, find the derivative of the function.

devlian [24]

Answer:

Dy/Dx=x ( 2 ln ( x ) − 1 )/ ln ^2 ( x)

Step-by-step explanation:

We have this function and let's derive it in terms of x.

y =x^2/In x

Dy/Dx=(x^2/In x)'=2/lnx *(x^2)'-(x^2/In x)'=> 2 x *ln ( x ) − x *ln ^2 ( x ) =x ( 2 ln ( x ) − 1 )/ ln ^2 ( x)

7 0

3 years ago