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
gladu [14]
2 years ago
7

Help please! this ones easy i just dont know how to do it

Mathematics
1 answer:
nikitadnepr [17]2 years ago
5 0
Is there a variable for i?
You might be interested in
this is formula manipulation, I'd appreciate if the steps were provided. only respond if you know how to get the answer, thank y
marissa [1.9K]

Answer:

  1. r = 3V/(2πh²)
  2. h = 3V/b²
  3. r = 25/π cm ≈ 7.9577 cm
  4. w = 15 cm

Step-by-step explanation:

1. Multiply both sides of the equation by the reciprocal of the coefficient of r.

V\cdot\dfrac{3}{2\pi h^2}=r\\\\r=\dfrac{3V}{2\pi h^2}

__

2. Multiply both sides of the equation by the reciprocal of the coefficient of h.

V\cdot\dfrac{3}{b^2}=h\\\\h=\dfrac{3V}{b^2}

__

3. Solve the circumference formula for r, then substitute the given information.

C=2\pi r\\\\r=\dfrac{C}{2\pi}\qquad\text{divide by the coefficient of r}\\\\r=\dfrac{50\,\text{cm}}{2\pi}=\dfrac{25}{\pi}\,\text{cm}\approx 7.9577\,\text{cm}

__

4. Solve the perimeter formula for width, the substitute the given information and do the arithmetic.

P=2(L+W)\\\\\dfrac{P}{2}=L+W\qquad\text{divide by 2}\\\\\dfrac{P}{2}-L=W\qquad\text{subtract L}\\\\\dfrac{40\,\text{cm}}{2}-5\,\text{cm}=W=15\,\text{cm}

_____

In general, solving for a particular variable involves "undoing" what has been done to the variable, usually in the reverse order. In part 4, the variable W has L added and the sum is multiplied by 2. We "undo" those operations, last operation first, by dividing by 2 and subtracting L.

The properties of equality say you can do what you like to an equation as long as you do the same thing to both sides of the equation. So, when we say "divide by 2", we mean "divide both sides of the equation by 2." Likewise, "subtract L" means "subtract L from both sides of the equation."

4 0
3 years ago
8. Larisa buys 3 purses. Each purse costs $126.32. How much did Larisa spend? Draw or use bills and coins to solve. A $126.32 B
ella [17]

Answer:

The answer is (c) 368.96

7 0
1 year ago
In ΔABC, if AB = 10 and BC = 6, AC can NOT be equal to
Goshia [24]

Answer:

16

Step-by-step explanation:

adding any two sides of a triangle is allways greater than the third side

6 0
3 years ago
What times what equals 18
lions [1.4K]
9 x 2 = 18
6 x 3 = 18
and 18 x 1 = 18

8 0
3 years ago
Read 2 more answers
What is the order of √5 , -0.1, -5/3 , 0.7, √2 from least to greatest? A. √5, √2 , 0.7, -5/3 , –0.1 B. –0.1, 0.7, √2 , √5, -5/3
yKpoI14uk [10]
-5/3, -0.1, 0.7, -/2, -/5    Which is C
8 0
3 years ago
Other questions:
  • Differentiate with respect to t.. y = b cos t + t2 sin t
    10·2 answers
  • Rounding 84.7, 481.7, and 77.7 to the nearest tenth
    9·1 answer
  • What equation represents the relationship between“p” and “q” shown in the table?
    9·2 answers
  • A rectangular dance floor has a width of 12 meters and a length of 16 meters. What is the length of a diagonal of the dance floo
    11·1 answer
  • Using context clues, figure out what the word unlimited means in this passage. How did settlers view the movement west? The sett
    11·1 answer
  • UNIT 3 LAB QUESTIONS
    8·1 answer
  • I need help with this.​
    6·2 answers
  • The Tres Difficult race helps raise money for charity. According to the website, of the proceeds from ticket sales go directly t
    12·2 answers
  • What is the slope of the line that passes through the points (2, -3) and (2,−13) ?Write your answer in simplest form.
    11·1 answer
  • What is the shortest strip of fiber from which five pieces of the following lengths can be cut: 9 1/2 inches, 10 11/16 inches, 6
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!