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
Anton [14]
3 years ago
15

Which of the following functions is quadratic?

Mathematics
2 answers:
zysi [14]3 years ago
6 0
The answer is C. 
The definition of a "quadratic equation" is any equation that has a variable with an unknown value to a power no less than or more than 2. A is not the answer because nothing is to the 2nd power. B, although is to the second power, is simplified into just 4, so it has neither an unknown variable nor power of 2. D is also incorrect because when the 3 is distributed, the equation is just simply 12-3x, which has no power of 2. So C is correct because when the 7x is distributed, you get the equation 7x^2 +21x, which has both a variable with an unknown value and a power of two. 
Scilla [17]3 years ago
3 0

Answer:The correct answer is C, just did it, hope it helps ;)

Step-by-step explanation: C. 7x(x+3)

You might be interested in
Name the figure below in two different ways.
12345 [234]

Answer:

LDM

MDL

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
A farmer grows a new variety of pumpkin, hoping to have
azamat

Answer:

C

Step-by-step explanation:

7 0
2 years ago
Read 2 more answers
What is the length of the hypotenuse of the triangle below
Hatshy [7]
One way to solve this is to use Pythagorean theorem: the square of one leg of triangle plus square of other leg of the triangle equals c the hypotenuse (longest side of triangle). You might see this as the formula a^2 + b^2 = c^2, where a and b are the legs and c is the hypotenuse.
In this case, the legs are 3√2 and the hypotenuse is h.
Using the formula:
(3√2)² + (3√2)² = h²
18 + 18 = h²
h = 6

The other way to do this is with trigonometric angles.
Remember cosine is adjacent over hypotenuse.
cos(45°) = (3√2) / h
h = (3√2) / cos(45°)
h = 6

4 0
3 years ago
Read 2 more answers
A math test has 40 questions. A student answers 85% of the questions correctly. How many questions did the student answer correc
Novosadov [1.4K]

Answer:

34

Step-by-step explanation:

40 * 0.85 = 34

34 questions answered correctly

6 0
2 years ago
Read 2 more answers
Let Ebe the set of all even positive integers in the universe Zof integers, and XE : Z R be the characteristic function of E.
AnnZ [28]

Answer:

\mathbf{X_E (2) =  1}

\mathbf{X_E (-2) = 0 }  

\mathbf{\{ x \in Z: X_E(x) = 1\}  = E}

Step-by-step explanation:

Let E be the set of all even positive integers in the universe Z of integers,

i.e

E = {2,4,6,8,10 ....∞}

X_E : Z \to R be the characteristic function of E.

∴

X_E(x) = \left \{ {{1 \ if  \ x \ \  is \ an \ element \ of \ E} \atop {0 \ if  \ x \ \  is \ not \ an  \ element \ of \ E}} \right.

For XE(2)

\mathbf{X_E (2) =  1}  since x is an element of E (i.e the set of all even numbers)

For XE(-2)

\mathbf{X_E (-2) = 0 }   since  - 2 is less than 0 , and -2 is not an element of E

For { x ∈ Z: XE(x) = 1}

This can be read as:

x which is and element of Z such that X is also an element of x which is equal to 1.

∴

\{ x \in Z: X_E(x) = 1\} = \{ x \in Z | x \in E\} \\ \\  \mathbf{\{ x \in Z: X_E(x) = 1\}  = E}

E = {2,4,6,8,10 ....∞}

5 0
3 years ago
Other questions:
  • What is the surface area of the cube below?
    13·1 answer
  • Simplify (3x2 + 2x - 4)-(-4x2 – 3x + 4 ​
    9·1 answer
  • For this distance-time graph, what is the velocity of the car?
    12·1 answer
  • What’s the lowest. Omen multiply of 30, 40
    9·1 answer
  • A Community hall is in the shape of a cuboid. Work out the paint cost, tiles cost and total cost.
    13·1 answer
  • Which graph shows the solution to the system of linear inequalities?
    12·1 answer
  • BRAINLIEST AND EXTRA POINTS IF U HELP !
    9·2 answers
  • Here is a list of numbers 12 11 19 16 32 15 13​
    11·1 answer
  • Ali takes a full-time position as a makeup artist in Atlanta. Her starting salary is $29,000. Her taxes are 28%. What is her net
    12·1 answer
  • Please help me is this problem <, >, or =
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!