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
Scilla [17]
3 years ago
9

If a quadratic equation has a discriminant that equals zero, which of the following statements is always true?

Mathematics
1 answer:
kotegsom [21]3 years ago
7 0

Answer:

d. The equation has one solution and there is not enough information to determine the direction of the parabola.

Step-by-step explanation:

For a general quadratic equation

y = ax² +bx +c

the solution is

x = \dfrac{-b\pm\sqrt{b^2-4ac}}{2a}

The discriminant (D) is the part of the quadratic formula underneath the radical: b² - 4ac.

D tells us whether there are

  • two different real solutions
  • two identical real solutions ("one solution")
  • two complex solutions.

If D= 0,

x = \dfrac{-b}{2a}\pm0 = \mathbf{\dfrac{-b}{2a}}

and there are two identical solutions ("one solution").

The direction of the parabola depends on the sign of a.

That information is not given, so we cannot determine the direction of the parabola.

You might be interested in
Use the graph to answer the question.
stealth61 [152]
A 180 counterclockwise rotation about the origin followed by a reflection of the y-axis
6 0
3 years ago
Read 2 more answers
(image) The figure below is an isosceles triangle surmounted by a semi-circle. Find the area of the entire region.
S_A_V [24]

Answer:

12.53

Step-by-step explanation:

∠BCA = (180°-40°)/2 = 70°

Laws of Sines: CA/sin 40° = AB/sin 70° = 5/sin 70°

CA = 5/sin 70° * sin 40° = 3.40

area of semicircle CA = (3.1416 * 1.70²) / 2 = 4.54

By Heron's Formula, area of triangle ABC:

1/4 √(a+b+c) (a+b-c) (b+c-a) (c+a-b) = 1/4 * √13.4*3.4*3.4*6.6

                                                          = 7.99

Entire region area = 4.54 + 7.99 = 12.53

5 0
2 years ago
Solve for the variable y.<br><br> y - 8 = 22<br><br> y=
MAVERICK [17]

Answer:

y=30

Step-by-step explanation:

y-8=22

Add 8 on both sides

y=30

6 0
3 years ago
Abby Kratz, a market specialist at the market research firm of Saez, Sikes, and Spitz, is analyzing household budget data collec
FrozenT [24]

Answer:

d) $128.65

Step-by-step explanation:

The table format from the question can be properly expressed as :

                       Coefficients       Standard Error     t Statistic    p  value

Intercept           39.14942          22.30182             1.755436     0.109712

x                         1.792312          0.407507             4.398234    0.001339

Source            df            SS                MS             F             S_e = 29.51443

Regression      1       16850.99      16850.99   19.34446    r^2 = 0.682478

Residual          9       7839.915       871.1017

Total               10       24690.91

For a rural household with $90,000 annual income, Abby's model predicts weekly grocery expenditure of:_________.

The estimated regression equation is as follows:

Expenditure (y) = 39.15 + 1.79 x

For a rural household with $90,000 annual income; the independent variables will assume the following values

x = 50

Thus; the estimated groceries expenditure is computed from the above regression equation by replacing the values of the independent variables;

This can be expressed as:

y = 39.15 + 1.79 (50)

y = 39.15 + 89.5

y = $128.65

7 0
3 years ago
Find the degree of the polynomial: <br> 8xyz^7-8x^3yz^4+2x^3y^3
Nuetrik [128]

Answer:

The degree of the polynomial is 9

Step-by-step explanation:

Recall that the degree of a polynomial is given by the degree of its leading term (the term with largest degree). Recall as well that the degree of a term is the maximum number of variables that appear in it.

So, let's examine each of the terms in the given polynomial, and count the number of variables they contain to find their individual degrees. then pick the one with maximum degree, and that its degree would give the actual degree of the entire polynomial.

1) term  8\,x\,y\,z^7  contains one variable "x" , one variable "y", and seven variables "z", so a total of nine. Then its degree is: 9

2) term -8\,x^3\,y\,z^4 contains three variables "x" , one variable "y", and four variables "z", so a total of eight. Then its degree is: 8

3) term 2\,x^3\,y^3 contains three variables "x" and three variables "y", so a total of six variables. Then its degree is : 6

Therefore, the leading term of this polynomial is the first one, and it gives its degree to the entire polynomial. the polynomial is of degree 9.

7 0
3 years ago
Other questions:
  • Ted invests $1077 in a savings account with a fixed annual interest rate of 9% compounded three times per year. What will be the
    15·1 answer
  • four sisters bought a present for their mother. They received a 10% discount on the original price of the gift. after the discou
    10·2 answers
  • Write 3.27 as a decimal number rounded to the nearest thousandth
    14·2 answers
  • Fill in the blank to complete the equation. Then find quotion 5÷1/2
    11·1 answer
  • 39 = 1 3/10 b<br><br> Find out what b is.
    12·1 answer
  • What is the solution to the equation 4t+5 =3- radical equation
    10·1 answer
  • Which equation is equivalent to 3[x + 3(4x – 5)] = 15x – 24?
    5·2 answers
  • -37900 divided by -1750
    9·1 answer
  • What is the slope of the line that passes through the points (8, -4)(8,−4) and (6, 2) ?(6,2)?
    12·1 answer
  • A boat heading out to sea starts out at Point A, at a horizontal distance of 1465 feet
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!