1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
klio [65]
3 years ago
13

The radius of a circle is increased by 3 in., which increases the area by 100 in. Find the radius of the original circle. Round

to the nearest hundredth.
Mathematics
1 answer:
Licemer1 [7]3 years ago
6 0

Answer:

3.81 inches

Step-by-step explanation:

πr² + 100 = π(r+3)²

divide by π and simplify:

r² + (100/π) = r² + 6r + 9

100/π = r² + 6r + 9

31.8309886184 - 9 = r² +6r

r² = 6r - 22.8309886184

0 = 6r - 22.8309886184

22.8309886184 = 6r

divide by 6:

3.80516476973 ≈ 3.81 inches

You might be interested in
Help.. please... my due is in 5 minutes ​
Diano4ka-milaya [45]
<h3>Answer:</h3>

y = x - 5

<h3>Step-by-step explanation:</h3>

If 5 is being subtracted from x, then it would look like x-5.

Since x-5 represents 5 being subtracted from x, y=x-5 is the correct answer because the other options aren't representing 5 subtracted from x.

3 0
2 years ago
-377 = x - 1,000 i dont under stand it
Naddika [18.5K]

Answer:

\boxed {x = 623}

Step-by-step explanation:

Solve for the value of x:

-377 = x - 1,000

-Switch sides:

-377 = x - 1,000

x - 1,000 = -377

-Add 1,000 on both sides:

x - 1,000 + 1,000 = -377 + 1,000

\boxed {x = 623}

Therefore, the value of x is 623.

4 0
3 years ago
Please help me thanks please
Ludmilka [50]

Answer: 3234 cubic units

Step-by-step explanation:

Volume of cylinder: πr²h

The diameter of the cylinder is 14 units so the radius is 7 units.

Now we'll substitute.

π = 22/7

h = 21

πr²h

π × 7² × 21

22/7 × 49 × 21 = 3,234

The volume is 3,234 cubic units.

6 0
3 years ago
Need help subtracting negative numbers
Tema [17]
Ok -7-7=-14 because your subtracting a negative with a negative and then it will be a negative then if you multiply a negative and a negative it will be a positive 

8 0
3 years ago
Read 2 more answers
A savings account compounds interest, at a rate of 22%, once a year. George puts $750 in the account as the principal. How can G
Umnica [9.8K]
George shouldn't think too far.

He should use the formula for Compound Interest.

Amount in compound interest, A = P(1+ r/100)ⁿ.

Where A = Amount, P = Principal, r is the rate per year, n = number of years.

Note: the expression (1+ r/100) is raised to power  n.     

From George's problem: P = 750,    r = 22,  I guess number of years , n = x

A(x) = 750( 1 + 22/100)ˣ

A(x) = 750( 1 + 0.22)ˣ 

From your options I can't see an answer. Except the expression of option (A) is actually raised to power x, and not times x as stated in the option.  
5 0
3 years ago
Other questions:
  • Year 1978 1979 1980 1990 1991 1996 1997 2007 2008 2009 Minimum hourly wage ($) 2.65 2.90 3.35 3.80 4.25 4.75 5.15 5.85 6.55 7.25
    6·1 answer
  • Describe the graph of the function f(x) = x3 − 15x2 + 68x − 96. Include the y-intercept, x-intercepts, and the end behavior.
    13·1 answer
  • Simplify. 8u+9v+3u−5v<br> a. 5u + 4v<br> b. 15uv<br> c. 11u + 4v<br> d. 11u + 14v
    7·2 answers
  • Solve for x in the equation x2+4x-4-8.
    11·1 answer
  • Graph y= -2/3x + 490
    11·2 answers
  • The basketball team practices every day from 2:30 pm to 4:00 pm.todays practice ended 20 minutes early.at what time did basketba
    7·1 answer
  • What is the answer to 3 3/8 plus 5/12
    14·1 answer
  • I need help pleaseeee
    14·1 answer
  • Geometry question help
    14·1 answer
  • I don't understand which selection it would be for each.
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!