All categories

3 years ago

Pls help me, if you get it right I will give you Brainlist!

Mathematics

1 answer:

o-na [289]3 years ago

8 0

Answer:

38.5

Step-by-step explanation:

The formula for the area of the circle is $\pi rx^{2} \\$ .

Since you have the diameter and you're told to use 3.14 as pi, all you need to do is to substitute.

The diameter is also 2 times the size of the radius so you divide 7 by 2.

So $(3.14)(3.5)^{2} = 38.5$

You might be interested in

What is the cost of one egg if a dozen eggs cost $1.08? PLEASE HELP MEE

marishachu [46]

Answer:

0.09

Step-by-step explanation:

8 0

3 years ago

Read 2 more answers

20 kilograms increased by 25%

IgorC [24]

Answer:

25 kilograms

Step-by-step explanation:

4 0

2 years ago

F(x)=1/2x show steps please!!<br><br> find f(-3)

garri49 [273]

Answer:

x = -6f

Step-by-step explanation:

solve for x by simplifying both sides of the equation, then isolating the variable.

8 0

3 years ago

If f(x) = 3x2 + 1 and g(x) = 1 - x, what is the value of (f-9)(2)?

kogti [31]

Answer:

Step-by-step explanation:

3 0

3 years ago

Find the absolute maximum and minimum values of f(x,y)=xy−4x in the region bounded by the x-axis and the parabola y=16−x2.

skad [1K]

Answer:

The absolute maximum and minimum is $20\; \text{and} -20.$

Step-by-step explanation:

We first check the critical points on the interior of the domain using the

first derivative test.

$f_x=y-4=0$

$f_y=x=0$

The only solution to this system of equations is the point (0, 4), which lies in the domain.

$f_{xx}=0, \;f_{yy}=0\; \text{and}\; f_{xy}=-1$

$\Rightarrow f_{xx}f_{yy}-f_{xy}=o-1=-1$

$\therefore (0,4)$ is a saddle point.

Boundary points - $(4,0), (-4,0), (0,16)$

Along boundary $y=16-x^2$

$f=x(16-x^2)-4x$

$=16x-x^3-4x$

$\Rightarrow f^'=16-3x^2-4=0$

$\Rightarrow 3x^2=12$

$\Rightarrow x=\pm2,\;\;y=14$

Values of f(x) at these points.

$\begin{array}{}(4,0)=-16\\(-4,0)=16\\(0,16)=0\\(2,14)=20\\(-2,14)=-20\end{array}$

Therefore, the absolute maximum and minimum is $20\; \text{and} -20.$

6 0

4 years ago

Pls help me, if you get it right I will give you Brainlist!​

Pls help me, if you get it right I will give you Brainlist!