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
Elenna [48]
3 years ago
9

I need help I will give brainiest​

Mathematics
1 answer:
timofeeve [1]3 years ago
8 0
14. the answer is 60
15. the answer is 150
You might be interested in
4) From whose point of view is the story written? Give an example from the story to support your answer? *
Ksivusya [100]
I believe this is 1st person
6 0
3 years ago
Read 2 more answers
PLZ HELP ME I REALLY NEED IT
kenny6666 [7]

r = 2 inches

total h of the cylinder = 6+6+6 = 18 inches

SA = 2\pi {r}^{2}  + 2\pi \: rh

= 2\pi \: r(r + h)

= 2 \times 3.14 \times 2(2 + 18)

= 2 \times 3.14 \times 2 \times 20

= 251.2square \: inches

4 0
3 years ago
What is the slope of y = -4?
I am Lyosha [343]

Answer:

slope is 0 and the y-intercept is -4!

Step-by-step explanation:

4 0
3 years ago
A rectangle box with a square base and no top needs to be made using 300ft^2 of material. Find the dimensions of the box with th
Yuri [45]

The dimensions of the box are 10 ft and 5 ft

The maximum volume is 500 ft³

Step-by-step explanation:

A rectangle box with

  • A square base and no top
  • It needs to be made using 300 ft² of material
  • It has greatest volume

Surface area of a box without top (SA) = perimeter of base × height + area of the base

Volume of a box (V) = base area × height

Assume that the length of the side of the square base is x and the height of the box is y

∵ It needs to be made using 300 ft² of material

∴ The surface area of the box is 300 ft²

∵ Its base is a square of side length x ft

∴ Perimeter of the base = 4 × x = 4 x

∴ Area of the base = x²

∵ The height of the box = y ft

∵ SA = perimeter of base × height + area of the base

∵ SA = (4x)(y) + x²

∴ SA = 4xy + x²

∵ SA of the box = 300 ft²

- Equate the two expressions of SA

∴ 4xy + x² = 300

Now let us find y in terms of x

- Subtract x² from both sides

∴ 4xy = 300 - x²

- Divide each term by 4x to find y

∴ y=\frac{75}{x}-\frac{1}{4}x

∵ V = area of the base × height

∴ V = x² × y = x²y

- Substitute y by the equation of it above

∴ V=x^{2}(\frac{75}{x}-\frac{1}{4}x)

∴ V=75x-\frac{1}{4}x^{3}

∵ The volume of the box is greatest

- That means differentiate V and equate it by 0

∵ \frac{dV}{dx}=75-\frac{3}{4}x^{2}

∵ \frac{dV}{dx}=0 ⇒ greatest volume

∴ 75-\frac{3}{4}x^{2}=0

- Subtract 75 from both sides

∴ -\frac{3}{4}x^{2}=-75

- Divide both sides by -\frac{3}{4}

∴ x² = 100

- Take √ for both sides

∴ x = 10

Substitute the value of x in the equation of y

∵ y=\frac{75}{10}-\frac{1}{4}(10)

∴ y = 5

The dimensions of the box are 10 ft and 5 ft

∵ V=75x-\frac{1}{4}x^{3}

∵ x = 10

∴ V=75(10)-\frac{1}{4}(10)^{3}

∴ V=750-\frac{1}{4}(1000)

∴ V = 750 - 250

∴ V = 500 ft³

The maximum volume is 500 ft³

Learn more:

You can learn more about the volume in brainly.com/question/6443737

#LearnwithBrainly

6 0
3 years ago
Which of the following expressions is equal to 3x^2 + 27
Kisachek [45]
Factor: 
3x^2 + 27
= 3(x^2  + 9)
Answer is 3(x^2 + 9), when factored.


A) (3x + 9i)(x + 3i)
= (3x + 9i)(x + 3i)
= (3x)(x) + (3x)(3i) + (9i)(x) + (9i)(3i)
= 3x^2 + 9ix + 9ix + 27i^2
= 27i^2 + 18ix + 3x^2



B) (3x - 9i)(x + 3i)
= (3x +  - 9i)(x + 3i)
= (3x)(x) + (3x)(3i) + ( - 9i)(x) + (- 9i)(3i)
= 3x^2 + 9ix - 9ix - 27i^2
= 27i^2 + 3x^2


C) (3x - 6i)(x + 21i)
= (3x +  - 6i)(x + 21i)
= (3x)(x) + (3x)(21i) + (- 6i)(x) + ( -6i)(21i)
= 3x^2 + 63ix - 6ix - 126i^2
=  - 126i^2 + 57ix + 3x^2






D) (3x - 9i)(x - 3i)
=  (3x +   - 9)(x +  - 3)
= (3x)(x) + (3x)( - 3i) + (- 9)(x) + ( - 9)( - 3i)
= 3x^2 - 9ix - 9x + 27i
= 9ix + 3x^2 + 27i - 9x









Hope that helps!!!

8 0
3 years ago
Read 2 more answers
Other questions:
  • the rop of a table is in the shape of a trpezoid.it has height 1.5 feet and two parallel bases measure 3 feet and 5 feet.what is
    10·1 answer
  • Consider the following pair of equations:
    8·1 answer
  • If ƒ(x) = 15x + 7 and g(x) = x2 – 5x, find (ƒ + g)(x).
    5·1 answer
  • Simplify 6÷2-18÷3 help me please !!
    13·1 answer
  • A gardener is planting two types of trees: Type A is 4 feet tall and grows at a rate of 17 inches per year. Type B is 7 feet tal
    11·1 answer
  • Which statement best describes the interquartile range of this set of weights? {120 lb, 115 lb, 135 lb, 105 lb, 80 lb, 160 lb} t
    10·1 answer
  • 2.<br> Solve for y.<br> y/8 = 8
    15·1 answer
  • How does scale factor change the area?
    6·1 answer
  • What is the equation in slope-intercept form of the line that passes through the point(-4,7) and is perpendicular to y=4x+15
    12·1 answer
  • Don't you times by a thousand then times the answer<br> I got 60,000
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!