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
Paha777 [63]
3 years ago
7

If the area of a circle is 81π, then what is the diameter of the circle?​

Mathematics
1 answer:
viva [34]3 years ago
7 0

Answer:

18

Step-by-step explanation:

81π=πr^2

r= 9,-9

9+9=18

You might be interested in
Find the circumference and area of a circle with radius 8 cm. Express<br>your answer in terms of pi​
BigorU [14]

Answer:

c=16*pi

a=64*pi

Step-by-step explanation:

7 0
3 years ago
Help!! please! Will mark Brainliest!
Karo-lina-s [1.5K]

Answer:

A) 264 ft^2, 4 gallons

Step-by-step explanation:

Area of rectangle = 12 ft x 18 ft = 216 ft^2

Area of triangle = 1/2 (28- 18)(12) = 1/2(10)(12) = 60 ft^2

Area of window: 3 ft x 4 ft = 12 ft^2

Areas will be painting = (216 + 60) - 12 = 264 ft^2

1 gallon of paint will cover 70 ft^2 so 264 ft^2 / 70 ft^2 = 3.77 gallons

So Mr. Williams will need 4 gallons of paint to cover 264 square feet of his barn

7 0
3 years ago
​ Quadrilateral ABCD ​ is inscribed in this circle.
Ilya [14]
Hello,

When you have an inscribed quadrilateral, the opposite sides are supplementary.

So you can write and solve the following equation.
x + 6x + 19 = 180
7x + 19 = 180
7x = 161
x = 23

Now, plug in 23 for X and we will find the measurement of B.
6(23) + 19
138 + 19
157

The measure of angle B is 157 degrees. (The picture is not drawn to scale)

Good luck,
MrEQ
3 0
3 years ago
Mr. Romero is buying a cell phone that has a regular price of $649. The cell phone is on sale for 15% off the regular price. Wha
Dafna11 [192]

Answer:

15 \div 100 \times 649 = 97.35 \\ 649 - 97.35 = 551.65

therefore the new price is $551.65

6 0
3 years ago
In a recent survey, 60% of the community favored building a health center in their neighborhood. If 14 citizens are chosen, find
andreev551 [17]

Answer:

Probability that exactly 5 of them favor the building of the health center is 0.0408.

Step-by-step explanation:

We are given that in a recent survey, 60% of the community favored building a health center in their neighborhood.

Also, 14 citizens are chosen.

The above situation can be represented through Binomial distribution;

P(X=r) = \binom{n}{r}p^{r} (1-p)^{n-r} ; x = 0,1,2,3,.....

where, n = number of trials (samples) taken = 14 citizens

         r = number of success = exactly 5

        p = probability of success which in our question is % of the community

              favored building a health center in their neighborhood, i.e; 60%

<em>LET X = Number of citizens who favored building of the health center.</em>

So, it means X ~ Binom(n=14, p=0.60)

Now, Probability that exactly 5 of them favor the building of the health center is given by = P(X = 5)

        P(X = 5) = \binom{14}{5} \times 0.60^{5} \times (1-0.60)^{14-5}

                      = 2002 \times 0.60^{5} \times 0.40^{9}

                      = 0.0408

Therefore, Probability that exactly 5 of them favor the building of the health center is 0.0408.

4 0
3 years ago
Other questions:
  • The mean of the data is 18. What number is missing? 21,11,_,27,22,13,16
    13·1 answer
  • Marta ate a quarter of a whole pie. Edwin ate 1/4 of what was left. Cristina then ate 1/3 of what was left. What fraction of the
    13·2 answers
  • How do you find the range
    11·2 answers
  • Please help me solve this question
    13·1 answer
  • Use the number line to find 3/4 × 2/5. Label all the parts above and below. question number 10(picture included)
    15·1 answer
  • Mrs. Kremer uses a 15% off coupon when she buys a camera. The original price of the camera is $225.How much money did she pay fo
    13·1 answer
  • Which graph represents the function y - 3 = 3/2 (x-4)
    8·1 answer
  • Here have some points I don't want these ones specifically
    14·2 answers
  • Angle ABC is a straight angle. The measure of angle ABD is x. What is the value of x?
    6·2 answers
  • At a camp with 300 campers and 15 counselors, what is the camper-counselor ratio?​
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!