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2 years ago

What expression shows 4 less than a number? A. n + 4 B. n - 4 C. 4 - n D. n(4)

Mathematics

2 answers:

SCORPION-xisa [38]2 years ago

7 0

$\huge \text{Hiya!}$

Answer:

<em>Option B. n - 4</em><em> Is my Answer</em>

Step-by-step explanation:

n - 4 is showing 4 less than a number n.

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<h2>what is an experssion?</h2>

an expression is one or a group of terms that may include. variables, constants, operators, and grouping symbols.

I hope this helps you!

Have a great day!

$-Joseph-$

Elis [28]2 years ago

3 0

Answer:

Step-by-step explanation:

Because the expression in b is saying whatever number n is say 9 then your subtracting 4 by N or like I said take 9 for an example which=5

hope it helps

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The surface of a hill is modeled by z = 100 − 4 x 2 − 2 y 2 . When a group of hikers reach the point (-3,-2,56) it begins to sno

m_a_m_a [10]

Answer:

(-24, -8)

Step-by-step explanation:

Let us recall that when we have a function f

$\large f:\mathbb{R}^2\rightarrow \mathbb{R}\\f(x,y)=z$

<em>if the gradient of f at a given point (x,y) exists, then the gradient of f at this point (x,y) gives the direction of maximum rate of increasing and minus the gradient of f at this point gives the direction of maximum rate of decreasing</em>. That is

$\large \nabla f=(\frac{\partial f}{\partial x},\frac{\partial f}{\partial y})$

at the point (x,y) gives the direction of maximum rate of increasing

$\large -\nabla f$

at the point (x,y) gives the direction of maximum rate of decreasing

In this case we have

$\large f(x,y)=100-4x^2-2y^2$

and we want to find the direction of fastest speed of decreasing at the point (-3,-2)

$\large \nabla f(x,y)=(-8x,-4y) \Rightarrow -\nabla f=(8x,4y)$

at the point (-3,-2) minus the gradient equals

$\large -\nabla f(-3,-2)=(-24,-8)$

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4 years ago

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Answer:

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Step-by-step explanation:

Analysis of variance (ANOVA) "is used to analyze the differences among group means in a sample".

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If we assume that we have $3$ groups and on each group from $j=1,\dots,n_j$ we have $n_j$ individuals on each group we can define the following formulas of variation: