1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
WITCHER [35]
4 years ago
10

What is the easiest way remember quadratics equations?

Mathematics
1 answer:
Citrus2011 [14]4 years ago
5 0

Answer:

First step may be by understanding the formulas.

You might be interested in
From past experience, a company has found that in carton of transistors: 92% contain no defective transistors 3% contain one def
jasenka [17]

Answer:

E(X) = 0*0.92 + 1*0.03 +2*0.03 +3*0.02 = 0.1500

In order to find the variance we need to find first the second moment given by:

E(X^2) = \sum_{i=1}^n X^2_i P(X_i)

And replacing we got:

E(X^2) = 0^2*0.92 + 1^2*0.03 +2^2*0.03 +3^2*0.02 = 0.3300

The variance is calculated with this formula:

Var(X) = E(X^2) -[E(X)]^2 = 0.33 -(0.15)^2 = 0.3075

And the standard deviation is just the square root of the variance and we got:

Sd(X) = \sqrt{0.3075}= 0.5545

Step-by-step explanation:

Previous concepts

The expected value of a random variable X is the n-th moment about zero of a probability density function f(x) if X is continuous, or the weighted average for a discrete probability distribution, if X is discrete.

The variance of a random variable X represent the spread of the possible values of the variable. The variance of X is written as Var(X).  

Solution to the problem

LEt X the random variable who represent the number of defective transistors. For this case we have the following probability distribution for X

X         0           1           2         3

P(X)    0.92     0.03    0.03     0.02

We can calculate the expected value with the following formula:

E(X) = \sum_{i=1}^n X_i P(X_i)

And replacing we got:

E(X) = 0*0.92 + 1*0.03 +2*0.03 +3*0.02 = 0.1500

In order to find the variance we need to find first the second moment given by:

E(X^2) = \sum_{i=1}^n X^2_i P(X_i)

And replacing we got:

E(X^2) = 0^2*0.92 + 1^2*0.03 +2^2*0.03 +3^2*0.02 = 0.3300

The variance is calculated with this formula:

Var(X) = E(X^2) -[E(X)]^2 = 0.33 -(0.15)^2 = 0.3075

And the standard deviation is just the square root of the variance and we got:

Sd(X) = \sqrt{0.3075}= 0.5545

8 0
4 years ago
Mrs. Valdez wanted to determine the number of
PolarNik [594]

B

Step-by-step explanation:

8 0
4 years ago
2(z + –16) = 22 z=_______
olchik [2.2K]

First distribute the 2 through the parenthses.

So we get 2z + -32 = 22.

Since adding a negative is the same as subtracting,

we can change the problem to read 2z - 32 = 22.

Solving from here, add 32 to both sides to get 2z = 54.

Now divide both sides by 2 to get <em>z = 27</em>.

7 0
3 years ago
Read 2 more answers
Find the cubed roots of 8(cos216 + i sin216)
saw5 [17]

Step-by-step explanation:

z

3

=8(cos216

∘

+isin216

∘

)

z^3=2^3(\cos(6^3)^\circ+i\sin(6^3)^\circ)z

3

=2

3

(cos(6

3

)

∘

+isin(6

3

)

∘

)

\implies z=8^{1/3}\left(\cos\left(\dfrac{216+360k}3\right)^\circ+i\sin\left(\dfrac{216+360k}3\right)^\circ\right)⟹z=8

1/3

(cos(

3

216+360k

)

∘

+isin(

3

216+360k

)

∘

)

where k=0,1,2k=0,1,2 . So the third roots are

\begin{gathered}z=\begin{cases}2(\cos72^\circ+i\sin72^\circ)\\2(\cos192^\circ+i\sin192^\circ)\\2(\cos312^\circ+i\sin312^\circ)\end{cases}\end{gathered}

z=

⎩

⎪

⎪

⎨

⎪

⎪

⎧

2(cos72

∘

+isin72

∘

)

2(cos192

∘

+isin192

∘

)

2(cos312

∘

+isin312

∘

)

5 0
3 years ago
Pls help! marking brainliest!!
Vedmedyk [2.9K]

Answer:

x = 52

Step-by-step explanation:

∡RQS = 180 - (90 + 34)

∡RQS = 56°

∡PQS + ∡RQS = 180°

∡PQS = x + 72

x + 72 + 56 = 180

x + 128 = 180

x = 52

3 0
3 years ago
Other questions:
  • Please help asap 30 pts
    11·1 answer
  • Sec^2x+2sec=0. solve the equation for 0
    11·1 answer
  • The cost for 50 bananas at the sams grocery store is $10 if Sara wants to purchase only one banana how much will it cost
    9·1 answer
  • Last geometry questions please help..... I really need it
    7·1 answer
  • How do I find the length of this?
    12·2 answers
  • Will mark brainliest if CORRECT
    8·1 answer
  • In 20 free throw attempts, Raul made 8. Based on this data, what is a reasonable estimate of the probability that Raul will make
    9·1 answer
  • The simple interest on a sum of money invested for 6 months at 5% per annum is $1680. Find the amount of money invested
    8·1 answer
  • Help! Giving out extra points and brainlist
    12·2 answers
  • If the perimeter of the triangle is 32 centimeters, what is the length of each of the two sides?
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!