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
diamong [38]
3 years ago
11

I don’t know and need help I am very bad at their type of math please some one

Mathematics
1 answer:
shusha [124]3 years ago
3 0

Answer:

Steve should order the round pizza to get more crust.

Step-by-step explanation:

They are essentially asking which pizza has a larger perimeter, because we can assume that the crust is of equal thickness on either pizza. To find the side length of the square pizza we find the square root of the area, \begin{document}\\\sqrt{49}\\\end{document}\\=7 and to get the perimeter from the side length we multiply by 4, \begin{document}\\7*4=28\\\end{document}. To get the perimeter of the round pizza we first find the radius from the area. The formula for area of a circle is π*r^2 so we divide the area by π to get 49, and the square root of 49 gives us a radius of 7. To get perimeter of a circle, also called circumference, you multiply the diameter times π and the diameter is twice the radius. We multiply 7 by 2 to get the diameter, 14 and then multiply by pi to get the circumference which is approximately 43.982. 43.982 is larger than 28 so Steve should order the round pizza.

You might be interested in
Explain why you do not have to do computing to solve 15×0×(13+7)
neonofarm [45]
The answer is 300 if you do the per enthuses first
5 0
3 years ago
2x + 3x + 5 =<br><br>I need the answer asap​
madam [21]
In simplified form it is 5x+5
4 0
2 years ago
8y-2=-18 what is the answer
enot [183]
The answer is: y=-2
4 0
3 years ago
Please help me figure this out it’s due on 15 minutes
Olin [163]

Answer:

Step-by-step explanation:

1. area of square=10²=100 cm²

area of circle=πr²=π×2.5²=6.25π cm²

reqd. area=100-6.25π ≈80.375 cm²

2.

area of circle=π×2.5²=6.25π≈6.25×3.14≈19.625 cm²

area of rectangle=4×3=12 cm²

reqd. area=19.625-12≈7.625 cm²

3.

area of two circles=2×π×3²=18π≈18×3.14≈56.52 cm²

area of square=12²=144 cm²

reqd. area=144-56.52≈87.48 cm²

4.

area of smaller circle=π×4²=16π cm²

area of bigger circle=π×8²=64π cm²

area of two circles=16π+64π=80π cm²

diameter of bigger circle=4+4+8+8=24 cm

diameter of biggest circle=π×12²=144π

area of shaded region=144π-80π=64π≈200.96 cm²

5 0
3 years ago
A new screening test for Lyme disease is developed for use in the general population. The sensitivity and specificity of the new
Anit [1.1K]

Answer:

predictive value of a positive test = 18.18%

predictive value of a negative test = 94.03%

Step-by-step explanation:

Sensitivity = 60% = 0.6

Specificity = 70% = 0.7

Let True Positive = TP

True Negative = TN

False Negative = FN

Sensitivity = \frac{TP}{TP + FN} \\0.6 = \frac{TP}{TP + FN} \\0.6TP + 0.6FN = TP\\0.4TP = 0.6FN\\TP = 1.5 FN

Specificity = \frac{TN}{TN + FP} \\0.7 = \frac{TN}{TN + FP} \\0.7TN + 0.7FP = TN\\0.7FP = 0.3 TN\\TN  = 7/3 FP

Prevalence = 10% = 0.1

Three hundred people are screened, T_{total} = 300

Total number of people having the disease, T_{disease} = ?

Prevalence = \frac{T_{disease} }{T_{total} } \\0.1 =  \frac{T_{disease} }{300 }\\T_{disease} = 30

T_{disease} = TP + FN\\30 = TP + FN

But TP = 1.5 FN

30 = 1.5 FN + FN

30 = 2.5 FN

FN = 30/2.5

FN = 12

TP = 1.5 FN = 1.5 * 12

TP = 18

FP + TN = T_{total} - T_{disease} \\FP + TN = 300 - 30\\FP + TN = 270\\FP + \frac{7}{3} FP = 270\\\frac{10}{3} FP = 270\\FP = 27 * 3\\FP = 81

81 + TN = 270

TN = 189

To calculate the Predictive value of positive test (PPT)

PPT = \frac{TP}{TP + FP} * 100\\PPT = \frac{18}{18+81} * 100\\PPT = \frac{18}{99} * 100\\PPT = 18.18 \%

To calculate the Predictive value of negative test (PNT)

PPT = \frac{TN}{FN + TN} * 100\\PPT = \frac{189}{189+12} * 100\\PPT = \frac{189}{201} * 100\\PPT = 94.03 \%

7 0
3 years ago
Other questions:
  • The crowd at a music concert is estimated to be 14,000 people. The exact attendance is 10,528 people. What is the percent error?
    9·1 answer
  • Am I doing this right someone plz help me with this what’s the answer and the work for this
    11·1 answer
  • The Aluminum Association reports that the average American uses 56.8 pounds of aluminum in a year. A random sample of 50 househo
    8·1 answer
  • I need help ASAP !!!! Please
    11·1 answer
  • Pleaseeeee helppppppppp
    11·1 answer
  • PLEASE HELP MEE EVERYONE IS WASTING MY POINTs PLEASE
    5·1 answer
  • Hello. STOP RIGHT THERE... Please help me
    7·1 answer
  • PLEASE HELP I WILL MARK YOU BRAINLIEST IF CORRECT
    13·2 answers
  • Maria makes $16 per hour. She gets a 18% raise. What is her new hourly<br> rate?
    12·1 answer
  • What is the absolute deviation of 4 in this data set?
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!