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4 years ago

FREE BRAINLIEST

Mathematics

2 answers:

Sedbober [7]4 years ago

5 0

Answer:

2x+5 $\leq$ 15

Step-by-step explanation:

Setler79 [48]4 years ago

4 0

Answer:

See Below

Step-by-step explanation:

Ok, so you got:

The sum of twice a number and 5 is at most 15

Sum means we are going to add two things together, soo . .

___+___

Is at most means we are going to have:

___+___≤ ___

Twice a number and 5= 2x(a variable) + 5

(I'm going to use a as my variable, use whichever you like or are given)

2a + 5 ≤ __

Which will result in being greater than or equal to 15

So, your final equation would be:

2a + 5 ≤ 15

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3 years ago

Find the local extreme values of the function f(x, y) = xy - x2 - y2 - 3x - 3y + 12

aev [14]

$f(x,y)=xy-x^2-y^2-3x-3y+12$

First compute the first-order partial derivatives and find the critical points.

$f_x=y-2x-3$
$f_y=x-2y-3$

Both first order derivatives vanish at $(x,y)=(-3,-3)$ .

Computing the Hessian, we get

$\mathbf H(x,y)=\begin{bmatrix}f_{xx}&f_{xy}\\f_{yx}&f_{yy}\end{bmatrix}=\begin{bmatrix}-2&1\\1&-2\end{bmatrix}$

We have $\det\mathbf H(x,y)=3>0$ , which means $(-3,-3)$ is an extremum of $f(x,y)$ . Since $f_{xx}(-3,-3)=-2$ , this extremum is a local maximum of $f(x,y)$ with a value of 21.

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3 years ago

The perimeter of the base of a regular quadrilateral prism is 60 cm, the area of one of the lateral faces is 105 cm2.

yawa3891 [41]

For a better understanding of the solution, please follow the diagram in the attached file.

A regular quadrilateral is basically a square.

So, if the base of the prism has a perimeter of 60 cm, then the length of the side of the square will be $\frac{60}{4}=15 cm$ . It is shown of the diagram.

Now, from the diagram, it is clear that the lateral face area, which is given as 105 cm^2, is the product of the side of the square, which is known, and the unknown height, let us call it h. Thus, we will get the following equation:

$15\times h=105$

$\therefore h=\frac{105}{15}=7 cm$

This is depicted on the diagram.

Now, all our required parameters are in place. Thus, let us find what has been asked.

SURFACE AREA

Surface Area (SA) will be the sum of the areas of the two bases (squares) and the areas of the four lateral faces.

Since the side of one square base is 15 cm, therefore, the area of one square base will be $15^2$ .

Likewise, the area of one lateral surface is actually the area of a rectangle with length 15 cm and height 7 cm. Thus, it's area will be given as: $15\times 7$ .