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
morpeh [17]
3 years ago
6

Given the Quadratic, determine the value of the discriminant. 2x2 – 3x – 20 = 0

Mathematics
1 answer:
Andrews [41]3 years ago
4 0
2x2-3x-20=0
4-3x-20=0
2-20=-16
-3x-16=0
-3x=16
x= -5.33333
I think i did it right. i hope this helps.
You might be interested in
A pizza has a 14-inch diameter. What is the approximate area of the pizza? USE 3.14 for π.
REY [17]

Answer:

Step-by-step explanation:

How approximate is approximate?

I'll give you an answer to 2 decimal places.

Area = pi * r^2

r = d/2

d = 14

r = 14/2

r = 7

Area = 3.14 * 7^2

Area = 3.14 * 49

Area = 153.86 sq in.

Lots of pizza! Enjoy!

7 0
2 years ago
Read 2 more answers
The national mean sales price for a new one-family home is $181,900. A sample of 40 one-family homes in the south showed a sampl
SIZIF [17.4K]

Answer:

a

The  null hypothesis is  \mu  =  \$181,900

The alternative hypothesis is  \mu <  \$ 181.900

b

t = -2.92

c

p-value  =  0.0016948

d

There no sufficient evidence to support the conclusion that the population mean sales prices for new one-family homes in the South is less expensive than the national mean of $181,900

Step-by-step explanation:

From the question we are told that

   The  population mean is  \mu  =  \$ 181, 900

    The  sample size is  n =  40

    The  sample  mean is  \=  x  =  \$ 166,400

      The  sample  standard deviation is s= \$ 33, 500

The  null hypothesis is  \mu  =  \$181,900

The alternative hypothesis is  \mu <  \$ 181.900

 

Generally the test statistics is mathematically represented as

      t =  \frac{ \= x  -  \mu }{ \frac{s}{\sqrt{n} } }

=>    t =  \frac{  166400  - 181900 }{ \frac{33500}{\sqrt{40} } }

=>    t = -2.92

Generally the p-value is obtain from the z-table  the value is  

      p-value  =  P(Z < t ) = P(Z  <  -2.93) = 0.0016948

=>    p-value  =  0.0016948

From the calculation we see that  

     p-value  >  \alpha  hence we fail to reject the null hypothesis

Thus there no sufficient evidence to support the conclusion that the population mean sales prices for new one-family homes in the South is less expensive than the national mean of $181,900

3 0
3 years ago
At noon, Bradley began steadily increasing the
barxatty [35]

Answer:

25.5 mph

Step-by-step explanation:

So Bradley's speed can be modeled by the equation y=2x+40 where y=speed, x=time in hours after noon, and b=initial speed

So 12:15 is 15 minutes after noon, which is also 0.25 or 1/4 of an hour after noon. This is the x-value. Plug this into the equation to get his speed at 12:15

y=2(0.25)+40

y=0.5+40

y=40.5

So his speed was 40.5 at the time and since he was going 15 miles over the speed limit, the speed limit is 15 less than his speed

40.5 - 15 = 25.5

8 0
2 years ago
Read 2 more answers
I need help asap!! i’ll give brainliest if right
iris [78.8K]

Answer:

D

Step-by-step explanation:

It is a positive corrolation

5 0
3 years ago
Explain how to determine which numbers must be excluded from the domain of a rational expression. Please provide an example with
Katarina [22]

Answer:

  • When we are having a rational expression i.e. a expression of the type:

\dfrac{f(x)}{g(x)}

Where f(x) and g(x) are polynomial functions.

Now the domain of this rational expression is whole of the real numbers except the points where the function g(x) will be zero.

Hence we have to exclude the points where the given denominator quantity is zero.

  • Let us consider an example as:

  Let R(x) denote the rational function as:

R(x)=\dfrac{x^2}{(x-2)(x-3)}

Now the domain of this rational function will be whole of the real line minus the points where the denominator is zero.

We know that (x-2)(x-3) is zero when x=2 or x=3.

Hence, the domain of R(x) is: R- {2,3}.

7 0
3 years ago
Other questions:
  • What is the equation of the following line? Be sure to scroll down first to see
    5·1 answer
  • Find the sum or difference. (5a – 3b2 – a) + (b – 5 + 8a2)
    14·1 answer
  • For the bake sal, Sandra baked 4 trays of cookies, with 12 cookies on each tray. Teo baked 6 pans of brownies and divided each p
    10·1 answer
  • Which statements about finding the area of the equilateral triangle are true? Check all that apply.
    8·2 answers
  • What is the best way to prep for math during the summer?
    6·1 answer
  • Which choices are correct when determining the distance between −56 and −31?
    6·1 answer
  • C. One Solution
    12·1 answer
  • On a recent day,8euros were worth $11 and 32 euros were worth $44 .Enter an equation of the form Y = KX To show the relationship
    15·2 answers
  • Click an item in the list or group of pictures at the bottom of the proble correct position in the answer box. Release your mous
    12·1 answer
  • (SAT prep) Find the value of x in each case of the following exercises:
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!