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3 years ago

please give me the explanation for this question, been on it for like 3 hours and can't get the answer

Mathematics

2 answers:

BartSMP [9]3 years ago

8 0

Answer:

Step-by-step explanation:

What you have to do is to find the volume of both forms and add them together.

So the formula for area of a cone (the top half of the pylon) is:

V=πr^2(h/3)

So now we plug our values in.

V=π1^2(2/3)

Simplify.

V=2/3π

Next, we find the volume of the cylinder.

The formuhe formla for this is:

V=πr^2h

So again, we plug the values in

V=π1^2(3)

Simplify.

V=3π

Now we add the volume of the cylinder with the volume of the cone.

2/3π+3π=3 2/3π

Therefore, you need 2/3π cubic feet of concrete.

g100num [7]3 years ago

4 0

Answer: your answer is correct I don't understand why you can't get it

I got the exact same answer

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shaquana has a deck that measures 18 feet by 15 feet. She wants to increase each dimension by equal lengths so that its area tri

Svetach [21]

to increase each dimension by equal lengths so that its area triples is 12 feet.

The given dimensions are 18 feet by 15 feet.

We need to find how much should each dimension increase.

Shaquana wants to increase each dimension by equal lengths so that its area triples.

Let the increased length be x.

So, length =18+x feet and width=15+x feet.

As we know, the area of a deck=Length×Width

The original area of a deck=18×15=270 square feet.

Now, the new area of a deck=(18+x )×(15+x)=3×270

⇒270+15x+18x+x²=810 square feet

⇒x²+33x-540=0

Here, a=1, b=33 and c=-540 in $x=\frac{-b\±\sqrt{b^{2-4ac} } }{2a}$ .

⇒ $x=\frac{-33\±\sqrt{33^{2} -4 \times (-540)} }{2 \times 1}$

⇒ $x=\frac{-33\±\sqrt{1089 +2160} }{2 \times 1}=\frac{-33\±57}{2}$

⇒x=-45 or x=12

Length can not be a negative integer.

Therefore, to increase each dimension by equal lengths so that its area triples is 12 feet.

To learn more about the area of a rectangle visit:

brainly.com/question/20693059.

#SPJ1

6 0

1 year ago

Please help me with this and show work thank you

meriva

Step-by-step explanation:

answer is - 490 and please help me any question

4 0

3 years ago

Read 2 more answers

Can someone explain to me how to do this exercise?

kolbaska11 [484]

Hi
You should put into them.I mean
1-This is 2 part.First, you should put f(-1) then you should put what you found.
Solve is:f(-1)=3(-1)-2(-1)^2 so -3-2=-5 then put in other one:if f(-5):-15-50=-65
Is it correct?

4 0

3 years ago

What is the simplified value of the expression below?

slavikrds [6]

Answer:

I dont know the experssion but I will give you steps to figure it out!

Step-by-step explanation:

Before you evaluate an algebraic expression, you need to simplify it. This will make all your calculations much easier. Here are the basic steps to follow to simplify an algebraic expression:

remove parentheses by multiplying factors

use exponent rules to remove parentheses in terms with exponents

combine like terms by adding coefficients

combine the constants

When simplifying an expression, the first thing to look for is whether you can clear any parentheses. Often, you can use the distributive property to clear parentheses, by multiplying the factors times the terms inside the parentheses. In this expression, we can use the distributive property to get rid of the first two sets of parentheses.

Now we can get rid of the parentheses in the term with the exponents by using the exponent rules we learned earlier. When a term with an exponent is raised to a power, we multiply the exponents For example, (x2)2 becomes x4.

The next step in simplifying is to look for like terms and combine them. The terms 5x and 15x are like terms, because they have the same variable raised to the same power

Finally, we look for any constants that we can combine.

Now our expression is simplified. Just one more thing -- usually we write an algebraic expression in a certain order. We start with the terms that have the largest exponents and work our way down to the constants. Using the commutative property of addition, we can rearrange the terms and put this expression in correct order, like this.

8 0

3 years ago

What is 9+9n=9 show work please

strojnjashka [21]

9 + 9n = 9

*subtract 9 from both sides

9n = 0

*divide both sides by 9

n = 0/9 = 0

n = 0

6 0

3 years ago

Read 2 more answers