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2 years ago

Can you do 2 and 3 please and tell me how you got your answer?

Mathematics

1 answer:

alexandr402 [8]2 years ago

7 0

Answer:

2. Sorry, I don't how to put that into words, because i'm trying to use calculators, then figure out how they got their answer.

3. C

Step-by-step explanation:

2. ^

3. to get the difference between two numbers, (100 and 50, for example,) you must just simply have them minus each other, like simple math. 100 - 50 = 50.

So your difference between the number 100, and the number 50, are 50.

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Consider triangle ABC where AB=X+5, BC=X-2, area is 30cm squared. Find X by solving X^2+3X-70=0, and find the perimeter.

klasskru [66]

Answer:

What the hell AC is not given so you can't find the Perimeter

Step-by-step explanation:

x^2+3x-70=0

(x-7)(x+10)=0

x-7=0

x+10=0

x=-10

AB=x+5

AB=12

AB=-5

BC=x-2

BC=5

BC=-12

Area of ABC = 30cm2

Perimeter of ABC = AB+BC+AC

8 0

2 years ago

Which of the following best describes the solution to the system of equations below?

liraira [26]

For this case we have the following system of equations:

$6x + 3y = 6\\6x + 3y = 14$

We multiply the first equation by -1:

$-6x-3y = -6$

We have the following equivalent system:

$-6x-3y = -6\\6x + 3y = 14$

We add the equations:

$-6x + 6x-3y + 3y = -6 + 14\\0 = 8$

Equality is not fulfilled, so the system of equations has no solution.

Answer:

Option C

5 0

2 years ago

What is the perimeter of a triangle with side lengths of 9, 12, and 4x?

ludmilkaskok [199]

The answer is 21 + 4x.

You find this answer by adding up all the sides.
9+12+4x= 21+4x ... you don't add 4x because it has a variable that we do not know of the value.

3 0

3 years ago

There are 2125 seats in a stadium the stadium is divided into 25 sections how many seats are in each section

Fofino [41]

There are 85 seats in each section. 2125 divided by 25 is 85.

4 0

3 years ago

Use cylindrical coordinates. Find the volume of the solid that lies within both the cylinder x2 + y2 = 25 and the sphere x2 + y2

Inessa05 [86]

Answer:

Step-by-step explanation:

we are asked to find the volume of solid that lies within both the cylinder

$x^2 + y^2 = 25$

and

the sphere $x^2 + y^2 + z^2 = 49.$

Conversion from rectangular to cylindrical is

$x=rcost\\y = rsint\\z=z$

|J| =r

In cylindrical coordinates the volume is bounded by the cylinder r=5 and

$r^2+z^2 =49$

Hence we can write volume as

$\int \int \int dxdydz\\=\\\int _0^5 \int_0^{2\pi} \int_{-\sqrt{49-r^2} } ^{\sqrt{49-r^2} rdzdtdr\\= 2\pi \int _0^5 (2\sqrt{49-r^2} rdr\\=4\pi (-(49-r^2) (2/3)\\= \frac{4\pi}{3} (343-48\sqrt{6} )$

6 0

3 years ago