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
mariarad [96]
2 years ago
11

In the equation 4x2-5x=21, what is the value of b? 4 -5 -21

Mathematics
1 answer:
Aliun [14]2 years ago
7 0
4x^2-5x-21 is of the form ax^2+bx+c, a quadratic equation.

so b in this case is -5
You might be interested in
A prism, bases of which are equilateral triangles, circumscribes a sphere of radius 6. What is the volume of the prism?
koban [17]

Answer:

  1296√3 cubic units

Step-by-step explanation:

The volume of the prism will be the product of its base area and its height. Since it circumscribes a sphere with diameter 12, that is the height of the prism.

The central cross section of the sphere is a circle of radius 6, and that will be the size of the incircle of the base. That is, the base will have an altitude of 3 times that incircle radius, and an edge length of 2√3 times that incircle radius. Hence the area of the triangular base is ...

  B = (1/2)(6×2√3)(6×3) = 108√3 . . . . . square units

The volume of the prism is then ...

  V = Bh = (108√3)(12) = 1296√3 . . . cubic units

_____

<em>Comment on the geometry</em>

The centroid of an equilateral triangle is also the incenter and the circumcenter. The distance of that center from any edge of the triangle is 1/3 the height of the triangle. So, for an inradius of 6, the triangle height is 3×6 = 18. The side length of an equilateral triangle is 2/√3 times the altitude, so is 12√3 units for this triangle.

6 0
3 years ago
What is the volume of 10 2 in 5.5in
svetlana [45]

Answer:

  110 in³

Step-by-step explanation:

The volume of a rectangular prism is the product of its dimensions:

  V = LWH

  V = (10 in)(2 in)(5.5 in) = 110 in³

5 0
2 years ago
Find the inverse of y=log(-2x)
kodGreya [7K]

Answer:f

−

1

(

x

Step-by-step explanation:

5 0
2 years ago
100 POINTS PLZ HELPPP Drag each tile to the correct box. Arrange the expressions in increasing order of their estimated values.
andrew11 [14]

Answer:

<h3>\frac{\sqrt{24}- \sqrt{54} }{\sqrt{6}} = -1   </h3><h3>\sqrt{\frac{9}{20}*\frac{10\sqrt{2} }{3\sqrt{5} } = 1.4142</h3><h3>\frac{10\pi\sqrt{2}-8\pi\sqrt{2}}{2\sqrt{2}}  = π =3.14159</h3><h3>\pi\sqrt{\frac{5}{3}}\cdot\pi\sqrt{\frac{3}{5}} = π² = 9.8696</h3>

Explanation:

1.) Rewrite √24 = \sqrt{4*6} = 2\sqrt{6}   Rewrite √54 =\sqrt{9*6}= 3\sqrt{6}

Divide both terms by the denominator; √6 cancels. 2-3 = -1

2.) Rewrite as \frac{3}{2\sqrt{5}} ×\frac{10\sqrt{2}}{3\sqrt{5}}  The 3's cancel.  10/2 = 5√2 in the numerator.

√5 × √5 = 5 in the denominator.  The 5's cancel.

That leaves √2 ≈1.4142

3.) Divide the terms in the numerator by the term in the denominator.

√2's cancel.  10π/2 = 5π   8π/2 = 4π  

Subtract and we are left with π = 3.14159

4.) \pi\sqrt{\frac{5}{3}}\cdot\pi\sqrt{\frac{3}{5}}  The square roots are reciprocals. They multiply to 1

We are left with π × π = π² ≈  9.8696

<h3> </h3>

8 0
3 years ago
Read 2 more answers
A recipe calls for of a cup of milk for 10 cookies. How many cups of milk are needed to make 60 cookies?
harkovskaia [24]

Answer: 6 cups of milk

Step-by-step explanation:

1 cup =10 cookies

60 cookies divided 10 cookies= 6cups

3 0
2 years ago
Other questions:
  • How do solve the fraction 5 1\4 - 13/9=
    9·2 answers
  • You work at a T-shirt printing business. Of 1,300 T-shirts shipped, 106 are imperfect. If you choose a T-shirt at random from th
    6·2 answers
  • A recipe calls for 4 quarts popcorn and 3/4 grated cheese if you want to make 3/4 of that how much popcorn and grated cheese wil
    7·2 answers
  • Solve the equation.<br> 5x + 6 = 2(2x – 3)<br><br> x =
    12·2 answers
  • What number could be replaced with p? 8/12 = P/3
    5·1 answer
  • Please help me.
    15·1 answer
  • If you had to add two fractions with denominators of 4 and 5. What might the denominator of the sum be? Show more than one possi
    12·1 answer
  • 4/5 • 6 = x <br> What is x?
    10·1 answer
  • Molly has 4x + $10 and Ron has 20 - 5 x dollars how much money do they have altogether and how much money does Molly have been R
    7·2 answers
  • 1 point)
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!