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
Alex787 [66]
3 years ago
12

A sprinkler head had a 90-degree rotation and shoots 15 feet long. How much area is covered if there are 12 90-degree heads in o

ne yard? How many 90-degree head do you need to cover a 1200 square foot yard?
Mathematics
1 answer:
soldi70 [24.7K]3 years ago
7 0

Answer:

A) It can shoot 15 feet long and has a rotation of 90 degrees.

We can write this area:

Area = Angle*radius^2

The radius is 15 ft.

The angle must be written in radians, so we need to writhe 90° in radians.

180° is equal to pi.

Then 90° = (90°/180°)*pi = pi/2  

where pi = 3.14

Then our area is:

A = (3.14/2)*(15ft)^2 = 353.25 ft^2

B) If we have 12 of those in one yard, we can cover 12 times that area; this is:

A = 12*(353.25 ft^2) = 4239 ft^2

C) Now we want to find the angle such that the covered area for one sprinkler is equal to 1200 ft^2

Then we can replace it in the equation for the area and get:

1200ft^2 = angle*(15ft)^2 = angle*225 ft^2

angle = 1200/225 = 5.33

But this is in radians, so we may convert it to degrees.

We know that 3.14 = 180°

Then we have

5.33 rads = (5.33/3.14)*180° = 305.5°

You might be interested in
Please help me idk this
Elodia [21]
Factors are: 0, 1, 2, 4, 8, 16
6 0
3 years ago
Read 2 more answers
Someone help plzzzzz
slavikrds [6]

Answer:

8.5

Step-by-step explanation:

4 0
3 years ago
The original price of a scarf was 16$. During a store closing, a shopper saved $12 on the scarf. What percentage discount did sh
Rudiy27

Answer:

75%

Step-by-step explanation:

hope this helps!! please mark brainliest

6 0
3 years ago
what is the y intercept of the line with a slope of - 4/7 that also passes through the point (7 , - 7/2) ?
kondor19780726 [428]

The answer is the last option: \frac{1}{2}

Explanation:

1. You have that the equation of the line is:

y=mx+b

Where m is the slope of the line and b is the intercept with the y-axis.

2. Therefore, you must find b.

3. Then, you must substitute the points given in the problem and the slope into the equation of the line and solve for b, as following:

y=mx+b\\-\frac{7}{2}=(-\frac{4}{7})(7)+b\\-\frac{7}{2}=-4+b\\b=\frac{1}{2}

8 0
3 years ago
Assume that an IR, system returns a ranked list of 10 total documents for a given query. Assume that according to a gold-standar
BlackZzzverrR [31]

Answer:

Precision = 0.625

Recall = 0.5

Step-by-step explanation:

Data:

Let: total documents = 10

      relevant documents = 5

if 2 documents are removed, the total number of documents remaining will be

documents remaining = total - 2 documents

                                     = 10 - 2

                                     = 8 documents

therefore, the precision will be = \frac{relevant documents}{remainder after 2 docs are removed} \\= \frac{5}{8} \\= 0.625

Recall = \frac{5}{10}\\ = 0.5

8 0
3 years ago
Read 2 more answers
Other questions:
  • The mean of a set of five test scores is m. what is the sum of the five test scores?
    14·1 answer
  • Which statement describes the behavior of the function f (x) = 2 x Over 1 minus x squared
    7·1 answer
  • what statement is false. A. Every rational number is also real B. Every real number is also rational C. Every integer is also a
    8·1 answer
  • Answer of this question​
    15·1 answer
  • PLEASE HELP ME REALLY QUICK!
    12·2 answers
  • The guitar that you always wanted is on sale in the music store. It costs 2/3 the original price. The guitar now costs $1996.67,
    8·1 answer
  • Which is the graph of an even monomial function?
    15·1 answer
  • Phil collected data from several of his friends about the number of hours they spent sleeping and the number of hours they spent
    12·2 answers
  • 4(w + 1) = -6; w = <br> help asap
    11·2 answers
  • (Giving brainliest!!!)
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!