using integer to describe the situation 12 protons and an atom blank 18 electrons around an atom blank

I need help with number 3. And 4. Please help me you will get 17 points

Paha777 [63]

For # four Draw something like this <[email protected] (the @ being a filled circle) starting at positive 5.

8 0

3 years ago

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Please help me please help with this questions ASAP

neonofarm [45]

Answer:

I believe the answer is 3. Im not sure so sorry if you get it wrong

7 0

3 years ago

I need help on the Quadratic Formula.

sasho [114]

1. 3x² + 12x - 15 = 0
 x = -(12) +/- √((12)² - 4(3)(-15))
 2(3)
 x = -12 +/- √(144 + 180)
 6
 x = -12 +/- √(324)
 6
 x = -12 +/- 18 
 6
 x = -2 + 3
 x = -2 + 3 x = -2 - 3
 x = 1 x = -5
--------------------------------------------------------------------------------------------
2. 5x² + 11x + 2 = 0
 x = -(11) +/- √((11)² - 4(5)(2))
 2(5)
 x = -11 +/- √(121 - 40)
 10
 x = -11 +/- √(81)
 10
 x = -11 +/- 9
 10
 x = -1¹/₁₀ + ⁹/₁₀
 x = -1¹/₁₀ + ⁹/₁₀ x = -1¹/₁₀ - ⁹/₁₀
 x = ¹/₅ x = -2
--------------------------------------------------------------------------------------------
3. 2x² - 11x + 14 = 0
 x = -(-11) +/- √((-11)² - 4(2)(14))
 2(3)
 x = 11 +/- √(121 - 102)
 6
 x = 11 +/- √(9)
 6
 x = 11 +/- 3
 6
 x = 1⁵/₆ + ¹/₂
 x = 1⁵/₆ + ¹/₂ x = 1⁵/₆ - ¹/₂
 x = 2¹/₃ x = 1¹/₃
--------------------------------------------------------------------------------------------
4. 2x² - x - 15 = 0
 x = -(-1) +/- √((-1)² - 4(2)(-15))
 2(2)
 x = 1 +/- √(1 + 120)
 4
 x = 1 +/- √(121)
 4
 x = 1 +/- 11
 4
 x = ¹/₄ + 2³/₄
 x = ¹/₄ + 2³/₄ x = ¹/₄ - 2³/₄
 x = 3 x = 2¹/₂

4 0

3 years ago

B) The number of volume of a cylinder is half of its number of the total surface area.

faust18 [17]

Answer:

$V=179.6cm^3$

Step-by-step explanation:

the volume of a cylinder is given by:

$V=\pi r^2h$

where r is the radius and h is the height.

and the surface area:

$SA=2\pi r^2+2\pi rh$

the first term is the area of the circles and the second term is the area of the body.

since "The number of volume of a cylinder is half of its number of the total surface area." we will have that:

$V=\frac{1}{2}SA$

substitutig the equivalent expressions on each side:

$\pi r^2 h = \frac{1}{2} (2\pi r^2+2\pi r h)$

and we simplify and solve for the height (since is the value we don't know of the cylinder):

$\pi r^2 h = \pi r^2+\pi r h\\\pi r^2h-\pi rh=\pi r^2\\h(\pi r^2-\pi r)=\pi r^2\\h=\pi r^2/(\pi r^2-\pi r)$

we substitute the value of the radius $r=7cm$ , and we get:

$h=\pi (7cm)^2/(\pi (7cm)^2-\pi (7cm))\\h=153.938/(153.938-21.991)\\h=153.938/131.947\\h=1.1666cm$

thus the volume is:

$V=\pi r^2h$

$V=\pi (7cm)^2(1.1666cm)\\V=179.6cm^3$

3 0

3 years ago

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Samantha earns $22 per hour as a plumbing apprentice. How much does she earn per minute in cents?

m_a_m_a [10]

A. She would use hours to minutes, which you can do by dividing 22 by 60.
b. 22 / 60 = .366 repeating, or about .37 per minute

3 0

3 years ago

using integer to describe the situation 12 protons and an atom blank 18 electrons around an atom blank​

using integer to describe the situation 12 protons and an atom blank 18 electrons around an atom blank