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Ahat [919]
2 years ago
11

1. If the area of a circle is 81pi square feet, find its circumference.

Mathematics
1 answer:
My name is Ann [436]2 years ago
4 0

Answer:

the circumference is 18 pi feet.

Step-by-step explanation:

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Sum of two numbers is 24 and the difference is 15.What are the two numbers ?
Alexeev081 [22]
Let,
the bigger number  be "x"
the smaller number be "y"
Now, according to the question,
x + y = 24...........equation (1).............because the sum of numbers is 24
x - y = 15 .............equation (2)..................because their difference is 15

Taking equation (2),
x - y = 15
x = 15 + y ....................equation (3)

Now, Taking equation (1)
x + y = 24
(Substituting the value of "x" form equation (3) we get)
15 + y + y = 24
(Subtracting 15 on both sides, we get)
y + y = 24 - 15
2y = 9
y = 9 / 2
y = 4.5
Now, 
Taking equation (3)
x = 15 + y
(Substituting the value of y , we get)
x = 15 + 4.5
x = 19.5

So, the two numbers are 19.5 and 4.5

5 0
3 years ago
6. A two-story building measures 21 feet
Y_Kistochka [10]

Answer:

12

Step-by-step explanation:

First figure the ratio of the real building to the model which is 21 divide 3. So the ratio is 1:7, since we're finding the height of the model, we divide 7 by 84 which is 12

7 0
2 years ago
A spherical balloon with radius r inches has volume defined by the function below. find a function that represents the amount of
Rashid [163]
The function would be v (r+3)=4/3 π(r+3)^3.
8 0
3 years ago
Please help me in problem 8 I need help on it plzZ
stepladder [879]

Answer:

a.\ -3\\b.\ 6\\c.\ -5\\d.\ 4

Step-by-step explanation:

First, it is important to remember which are the Negative numbers and the Positive numbers.

The Positive numbers are defined as all those numbers that are greater than zero and the Negative numbers are defined as all those numbers that are less than zero.

Then:

a. "3 degrees below 0\°F" indicates that the temperature is actually -3\°F, which is less than zero. Then, it is a negative number:

-3

b. Let be 0 represents the sea level, "6 feet above the see level" indicates that the number is positive:

6

c. "Lost 5 pounds" indicates that now the actual weight is 5 pounds less than the original, which indicates that it must be expressed as a negative number:

-5

d. "Found \$4" means that now the actual amount of money is greater than it was before. Then, the number that represents this is a positive number:

4

6 0
3 years ago
Which of the following values would complete the ordered pair if the point is on the graph of f(x) = -2x + 3?
EastWind [94]
-2/1
+3
idk if this was what you needed but this is a way to put it on the graph

5 0
2 years ago
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