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
Brrunno [24]
3 years ago
15

X² – 2x=4

Mathematics
1 answer:
Shtirlitz [24]3 years ago
3 0

Answer:

x= -1.24, 3.24

Step-by-step explanation:

x² – 2x=4

Bring 4 over

x² – 2x - 4=0

Quadratic formula:

if ax²+bx+c=0

\frac{b(+-)\sqrt{b^2-4ac} }{2a} the (+-) = ±

\frac{-(-2)+\sqrt{(-2)^2-4*1*(-4)} }{2*1}= 3.24

\frac{-(-2)-\sqrt{(-2)^2-4*1*(-4)} }{2*1}= -1.24

You might be interested in
HELP ASAP ALL THREE PLEASE 1. if a cyclic alkene has 12 carbon atoms, how many hydrogen atoms does it have 2.if a cyclic alkene
Marina CMI [18]

Answer:

1. 24

2. 6

3. No

Step-by-step explanation:

The formula for cyclic alkene is C^{n} H^{2n}, so if it has 12 carbon atoms, it will have double the amount of hydrogen atoms, therefore, 24 hydrogen atoms.

The same works in reverse. If we have 12 hydrogen atoms in this, then there will be half the amount of carbon atoms, therefore 6.

Since the relationship between Carbon and Hydrogen here is double and half, odd numbers can't be divided by 2 and end up with a whole number, so an odd number of hydrogen atoms is not possible.

Hope this helped!

5 0
3 years ago
In a 45 45 90 right triangle the length of the hypotenuse is 15/2 what is length on one of the legs
Nikitich [7]
Hi there!

For any 45 45 90 right triangle, the length of the hypotenuse is always the square root of 2 times one of the legs.

To get the lengths of the leg, let's divide the length of the hypotenuse by the square root of 2.

We get the following:

\frac{15}{ 2 \sqrt{2} }

When simplifying fractions like this, we want to avoid having radicals on the bottom. In order to remove the radical from the denominator, let's multiply the numerator and the denominator by the square root of 2.

We get the following:

\frac{15 \sqrt{2} }{4}

That's your answer.

Have an awesome day! :)

- collinjun0827, Junior Moderator
8 0
3 years ago
PLEASE HELP SOON. Answer any amount.
LiRa [457]
No.5=1/3x=21
So x is twenty one21
6 0
3 years ago
The snack bar at your school has added sushi to its menu. The ingredients for one roll include sushi​ rice, seaweed​ sheets, cuc
amid [387]

Answer:

The answer si:  

- 16 servings - 6 oz of salmon

- 24 servings - 9 oz of salmon

- 80 servings - 30 oz of salmon

- 100 servings - 37.5 oz of salmon

1 roll is 8 servings and it is also made of 3oz of smoked salmon. That means that 3oz of smoked salmon is needed fo 8 servings.

Now, let's made some proportions:

16 servings:

3 oz is for 8 servings, how much oz is for 16 servings:

3 : 8 = x : 16

x = 3 · 16 ÷ 8 = 6 oz

24 servings:

3 oz is for 8 servings, how much oz is for 24 servings:

3 : 8 = x : 24

x = 3 · 24 ÷ 8 = 9 oz

80 servings:

3 oz is for 8 servings, how much oz is for 80 servings:

3 : 8 = x : 80

x = 3 · 80 ÷ 8 = 30 oz

100 servings:

3 oz is for 8 servings, how much oz is for 100 servings:

3 : 8 = x : 100

x = 3 · 100 ÷ 8 = 37.5 oz

5 0
3 years ago
Miguel asked Sandra to make 90 cookies for his party. Sandra needs ¼ cup of sugar to make 15 cookies. She incorrectly calculated
slega [8]

Answer:

She incorrectly multiplied 15 X 1/4

Step-by-step explanation:

7 0
3 years ago
Other questions:
  • Anthony has a cup full of nickels and dimes worth $6.80. There are 82 coins all together.
    7·1 answer
  • You roll 1 die. Find the probability of the number you end up rolling being less than 5.
    14·1 answer
  • Rylee knows that the area for the face painting station is 166 square feet. She knows that the length of the rectangular area is
    14·1 answer
  • If t is any real number, prove that 1+(tant)^2=(sect)^2
    5·1 answer
  • What is the correct height ?
    9·1 answer
  • Triangle ABC is a right triangle. Point D is the midpoint of side AB and point E is the midpoint of side AC. The measure of angl
    12·1 answer
  • 12. Use the Distributive Property to write
    5·1 answer
  • Which are solutions of the linear equation?<br> Select all that apply.<br> 3x + y = -10
    10·2 answers
  • Please help If you know the answer!!
    13·1 answer
  • Help will mark brainliest to best answer
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!