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4 years ago

How do i find the exact area of a circle

Mathematics

1 answer:

azamat4 years ago

3 0

Answer: To find the exact area of a circle, use the formula $\pi r^2$ .

Step-by-step explanation: Use 3.14 for pi or if you can, use the π symbol on your calculator. Find the radius and square it, then multiply by pi.

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If the dimensions of the following cylinder are doubled, what factor will the surface area change by?

AVprozaik [17]

To solve this problem you must apply the proccedure shown below:
1. You have that the radius and the height of the cylinder are:
$r=8 in \\ h=6 in$
2. So, you must calculate the area:
$A1=2 \pi (r+h)$
3. Substitute the values into the formula:
$A1=2 \pi (8 in)(8 in+6in) \\ A1=703.71 in^{2}$
4. When the radius and the height are doubled, you obtain:
$A2=2 \pi (16 in)(16 in+12 in) \\ A2=2814.86 in^{2}$
5. The factor is:
$F=2814.8 in^{2}/703.71 in^{2} \\ F=4$
The answer is: B. $4
$

4 0

3 years ago

Read 2 more answers

Find the prime factorization of 35.

jeka94

Answer:

1 5 7 35

Step-by-step explanation: im a differnet breed duh

7 0

3 years ago

Given that f(x)=x^2+3x-28f(x)=x

spayn [35]

9514 1404 393

Answer:

x^2 +4x -21

Step-by-step explanation:

Substitute the given expressions and simplify.

f(x) + g(x)

= (x^2 +3x -28) +(x +7)

= x^2 +(3+1)x +(-28 +7)

= x^2 +4x -21

6 0

3 years ago

5. Solve the equation. 8/x+3 = 1/x+1

Helga [31]

Answer:

x = -5/7

Step-by-step explanation:

8 1

---------- = ----------

x+3 x+1

Using cross products

8 (x+1) = 1 (x+3)

Distribute

8x+8 = x+3

Subtract x from each side

8x-x +8 = x-x+3

7x+8 =3

Subtract 8 from each side

7x +8-8 =3-8

7x = -5

Divide each side by 7

7x/7 = -5/7

x = -5/7

4 0

4 years ago

7. What's the sum of 2/5 and 2/4?

NISA [10]

Step-by-step explanation:

2/5+2/4 (find common denominator)

The common denominator is 20

2/5 is 8/20 (multiply by 4)

2/4 is 10/20 (multiply by 5)

8/20+10/20 is 18/20

If you simplify 18/20 this would by 9/10 if you divide by 2

so the total is 18/20 or 9/10 simplified

Hope this helps!!!!

Have a nice day :)

5 0

3 years ago

Read 2 more answers