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3 years ago

Compare and contrast expressions equations and inequalities

Mathematics

1 answer:

babymother [125]3 years ago

4 0

Equations can have one solution, but inequalities have infinite solutions.

Hope this helps!

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What substitution should be used to rewrite 4x^4-21x^2+20 =0 as a quadratic equation

marysya [2.9K]

I would substitute y = x^2

4y^2 -21y+20=0

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3 years ago

What do I do with the x squared

Alexxandr [17]

first, find the square root of 45. and make x normal. a square root cancels out a square. It should be 6.7x

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3 years ago

ing needs 3 cups of milk to make 30 cookies. How many ounces of milk would he need to make 120 cookies?

Llana [10]

Answer:

12 cup of milk.

Step-by-step explanation:

if 3 cups of milk can make 30 cookies it means 1 cup of milk can make 10 cookies then for 100 cookies we need 10 cup of milk and 30 more means 3 more so answer is 12

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3 years ago

A solid lies between planes perpendicular to the x-axis at x = -2 and x = 2. The cross-sections perpendicular to the x-axis b

icang [17]

Answer:

V = 128π/3 vu

Step-by-step explanation:

we have that: f(x)₁ = √(4 - x²); f(x)₂ = -√(4 - x²)

knowing that the volume of a solid is V=πR²h, where R² (f(x)₁-f(x)₂) and h=dx, then

dV=π(√(4 - x²)+√(4 - x²))²dx; =π(2√(4 - x²))²dx ⇒

dV= 4π(4-x²)dx , Integrating in both sides

∫dv=4π∫(4-x²)dx , we take ∫(4-x²)dx and we solve

4∫dx-∫x²dx = 4x-(x³/3) evaluated -2≤x≤2 or too 2 (0≤x≤2) , also

∫dv=8π∫(4-x²)dx evaluated 0≤x≤2

V=8π(4x-(x³/3)) = 8π(4.2-(2³/3)) = 8π(8-(8/3)) =(8π/3)(24-8) ⇒

V = 128π/3 vu

8 0

3 years ago

Please answer this question

makvit [3.9K]

Step-by-step explanation:

Using the properties of logarithms, the left side of the equation becomes

$\log{3x^3} - \log{x^2} = \log{3x}$

while the right hand side becomes

$\log{27} - \log{x} = \log{\frac{27}{x}}$

so we end up with

$3x^2 =27 \Rightarrow x = 3$

4 0

3 years ago