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
ASHA 777 [7]
2 years ago
6

A hubcap has a radius of 13 centimeters. What is the area of the hubcap? Round your answer to the

Mathematics
2 answers:
vladimir1956 [14]2 years ago
5 0

Answer:

A = 530.91 cm^2

Step-by-step explanation:

The formula to find the area of a circle is (A = (pi)r^2), where (A) represents the area of the circle, (pi) represents the value (3.1415...), and (r) represents the radius of the circle. Use this knowledge, and substitute in the given information, to solve for the area of the circle.

A = (pi)r^2\\\\A = (3.1415)(13)^2\\\\A = (3.1415)169\\\\A = 530.91

Varvara68 [4.7K]2 years ago
4 0

Answer:

530.66 square cm

Step-by-step explanation:

A=pi*r^2

A=pi*13^2

A=530.66

You might be interested in
Let f(x)=2x+2. Solve f^-1(x) when x=4
Gre4nikov [31]
F⁻¹(x) stands for the invers of function f(x). The inverse of f(x) is equal to x. We need to solve for x.

solve for x
f(x) = 2x + 2
2x + 2 = f(x)
2x = f(x) - 2
  x = \dfrac{f(x)-2}{2}
f⁻¹(x) = \dfrac{x-2}{2}

Determine the value of f⁻¹(x) when x = 4
f⁻¹(x) = \dfrac{x-2}{2}
f⁻¹(4) = \dfrac{4-2}{2}
f⁻¹(4) = \dfrac{2}{2}
f⁻¹(4) = 1
When x = 4, the value of f⁻¹(x) is equal to 1
4 0
3 years ago
1+2 please helpbyybyb
Aleks [24]
1+2 equals three i used a calculator
8 0
3 years ago
Read 2 more answers
Next question, need help ASAP please ​
Delvig [45]

Answer:

65.94

Step-by-step explanation:

7 0
3 years ago
If sally earns income of $80,000.00per yr. the 2.5% is taken out what will be sally's school taxes per yr.?
STALIN [3.7K]
Change the percentage into a decimal and multiply for the answer.

$80,000 * .025 = $2,000
3 0
3 years ago
Read 2 more answers
Head movement evaluations are important because disabled individuals may be able to operate communications aids using head motio
earnstyle [38]

Answer:

t=\frac{\bar d -0}{\frac{s_d}{\sqrt{n}}}=\frac{1.307 -0}{\frac{7.798}{\sqrt{14}}}=0.6271

df=n-1=14-1=13

p_v =P(t_{(13)}>0.6271) =0.2707

Step-by-step explanation:

A paired t-test is used to compare two population means where you have two samples in  which observations in one sample can be paired with observations in the other sample. For example  if we have Before-and-after observations (This problem) we can use it.  

Let put some notation  

x=test value CL , y = test value CO

x: 57.8 35.7 54.5 56.8 51.1 70.8 77.3 51.6 54.7 63.6 59.2 59.2 55.8 38.5

y: 44.7 52.1 60.2 52.7 47.2 65.6 71.4 48.8 53.1 66.3 59.8 47.5 64.5 34.4

The system of hypothesis for this case are:

Null hypothesis: \mu_x- \mu_y \leq 0

Alternative hypothesis: \mu_x -\mu_y >0

The first step is calculate the difference d_i=x_i-y_i and we obtain this:

d: 13.1, -16.4,-5.7,4.1,3.9,5.2,5.9,2.8,1.6,-2.7,-0.6,11.7,-8.7,4.1

The second step is calculate the mean difference  

\bar d= \frac{\sum_{i=1}^n d_i}{n}= \frac{29}{8}=1.307

The third step would be calculate the standard deviation for the differences, and we got:

s_d =\frac{\sum_{i=1}^n (d_i -\bar d)^2}{n-1} =7.798

The 4 step is calculate the statistic given by :

t=\frac{\bar d -0}{\frac{s_d}{\sqrt{n}}}=\frac{1.307 -0}{\frac{7.798}{\sqrt{14}}}=0.6271

The next step is calculate the degrees of freedom given by:

df=n-1=14-1=13

Now we can calculate the p value, since we have a right tailed test the p value is given by:

p_v =P(t_{(13)}>0.6271) =0.2707

So the p value is higher than the significance level provided of 0.01, so then we can conclude that we FAIL to reject the null hypothesis that the difference mean between after and before is higher or equal than 0. So we can't conclude that the mean neck rotation is greater in the clockwise direction than in the counterclockwise direction at 1% of significance.

8 0
3 years ago
Other questions:
  • carolineemployee of hollister brought a sweater at 55 for 38.50after her employee discount what percent off is employee discount
    5·1 answer
  • If a triangle has a height of 14 inches and a base of 9 inches what's the area
    8·2 answers
  • A. f(x) = x2 – 11x – 12
    6·2 answers
  • I am confuse how to solve this problems help!!!!
    9·1 answer
  • Ana bikes for 5.5 hours. She covers a distance of 57.75 mi. Assuming she bikes at a constant speed, how fast was Ana biking?
    14·2 answers
  • What is the solution to y-12=20
    5·2 answers
  • Find the mean absolute deviation of the set of data 4,5,8,8,10​
    7·1 answer
  • Three triangles are shown on the centimetre grid
    7·1 answer
  • Area of sector=?cm^2
    7·1 answer
  • Word Problem On Division
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!