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3 years ago

What of the following are parts of a sphere ?

Mathematics

1 answer:

Tamiku [17]3 years ago

7 0

I believe it’s just the base, radius, and maybe the total surface

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Prove the polynomial identity.

aleksandr82 [10.1K]

Explanation:

Since we have given that

$(2x+1)^2-2(2x+1)$

Now, we have to prove it as

$(2x+1)(2x-1)$

Now, start the iterations:

$(2x+1)^2-2(2x+1)\\\\=4x^2+1+4x-4x-2\\\\=4x^2+1-2\\\\=4x^2-1\\\\=(2x)^2-1\\\\=(2x+1)(2x-1)$

So, first blank will be filled with

$4x^2+4x+1$

Second blank will be filled with

$4x^2-1$

Hence proved.

7 0

3 years ago

HELPPPPPPPPPPPPPPPPPPPPPPPP!!!!!!!!!!!!!!

snow_lady [41]

Answer:

A. The area is $78.54m^2$

B. She needs to cover 1661.9 square feet of tiles for the base of the swimming pool

Step-by-step explanation:

Question A:

Let us assume that the leash is pegged to the ground using a stake. as a result, the dog can move around the stake. The path that the motion of the dog would trace is a circle, and the radius of the circle will be the length of the leash.

Since we know this, we can easily find the area of the circle using $\pi r^2$

Area of the circle = $\pi \times 5 \times 5 = 78.54m^2$

Question B

Dulce wants to cover the whole surface area of the floor of the circular swimming pool with tiles.

We already know that the swimming pool is circular, hence, the surface area of the base of the swimming pool will be the same as the area of a circle, with the same radius.

The area of the circle can be calculated using $\pi r^2$

Area of circle = $\pi \times 23 \times 23 = 1661.9ft^2$

8 0

3 years ago

Zach's phone plan costs $0.10 for each text message he sends. He has a $10 limit. Write and solve an inequality to determine how

sergejj [24]

Answer:

Zach can send at most 100 messages, or if x is how many messages, x≤100

Step-by-step explanation:

We will start by putting the amount of money Zach's limit has into cents. This will be 1000 cents. We will also put how much money Zach uses per message as cents, which will be 10. Now here is the first inequality you can make with this information

10x≤1000

From here you divide both sides of the inequality by 10 and get

x≤100

This is the final inequality, and it means Zach can send less than or equal to 100 messages

6 0

3 years ago

The angle of elevation to the top of a very tall building is found to be 13° from the ground at a distance of 1 mi from the base

Marta_Voda [28]

Tan(Θ)=(h/distance from base)
Θ=13 degrees, 1mile=5280 ft
tan(13)=(h/5280 ft)
5280tan(13)=h
h=1218.984049
h=1219 ft

4 0

3 years ago

AYOOOOOOOOOOO I NEED HELP WITH THIS QUESTION, WIL GIVE BRAINLIST

ser-zykov [4K]

Answer:

C. 2/9

Step-by-step explanation:

4/18=2/9

8 0

3 years ago

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