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
Burka [1]
3 years ago
15

what is the radius of a circle that has a sector area of 3pi cm squared and a central angle of 2pi/3 radians

Mathematics
2 answers:
tankabanditka [31]3 years ago
6 0

Answer:

r=3 cm

Step-by-step explanation:

In the attached file

cupoosta [38]3 years ago
6 0
Required radius is 3 cm
You might be interested in
The mean breaking strength of yarn used in manufacturing drapery material is required to be more than 100 psi. Past experience h
Ganezh [65]

Answer:

H0: μ = 100 ; H1: μ > 100 ;

Test statistic = 0.75 ;

We fail to reject null ;

Kindly check explanation for the rest

Step-by-step explanation:

Given that :

H0: μ = 100

H1: μ > 100

Sample mean, x = 100.6 ; n = 9 ; sample Standard deviation, s = 2.4

Test statistic :

(x - μ) ÷ s/sqrt(n)

(100.6 - 100) ÷ 2.4 / sqrt(9)

0.6 ÷ 0.8 = 0.75

Probability of not rejecting the null :

P = P(Z > 0.75) = 0.22663

α = 0.05

Since, P > α ; we fail to reject the Null ; there is no sufficient evidence to accept the claim that mean strength is > 100 psi

μ + Zcritical*s/sqrt(n)

Zcritical at (1 - α) = 1.645

100 + 1.645*(2.4/3)

100 + 1.316 = 101.316

(x - μ) ÷ s/sqrt(n)

(101.316 - 102) ÷ 2.4 / sqrt(9)

-0.684 ÷ 0.8 = 0.75

= - 0.855

P(Z < - 0.855) = 0.1963 (Z probability calculator).

95% lower confidence interval :

x - error margin, E

E = Zcritical * s/sqrt(n)

E = 1.645 * 0.8 = 1.316

100.6 - 1.316 = 99.284

From part c :

Interval becomes ;

(99.284, 101.316) ; this interval contains the hypothesized mean value of 100. Hence we fail to reject the null.

8 0
2 years ago
Find DF<br> D<br> 20<br> E 10 F<br> DF =
vichka [17]

Answer:

30

Step-by-step explanation:

it is right

8 0
3 years ago
Read 2 more answers
June has $1.95 in dimes and nickels. She has a total of 28 coins. how many of each type of coin does she have?
Dovator [93]

Answer:

11 dimes, 17 nickels

Step-by-step explanation:

d + n = 28, put one variable by itself on a side, d = 28 - n

.10d + .05n = 1.95

Sub the first equation into the second

.10(28 - n) + .05n = 1.95

2.8 - .10n + .05n = 1.95

2.8 - .05n = 1.95

-.05n = -0.85

n = 17 nickels

d + 17 = 28

d = 11  11 dimes

7 0
2 years ago
Read 2 more answers
The graph of the function C(x) = −0.34x2 + 12x + 62 is shown. The function models the production cost, C, in thousands of dollar
Virty [35]

Answer:

0 ≤ x < 1.12 and 34.18 < x ≤ 39.87

Step-by-step explanation:

Let

x ----> is the number of tires produced, in thousands

C(x) --->  the production cost, in thousands of dollars

we have

C(x)=-0.34x^{2} +12x+62

This is a vertical parabola open downward (the leading coefficient is negative)

The vertex represent a maximum

The graph in the attached figure

we know that

Looking at the graph

For the interval [0,1.12) -----> 0\leq x

The value of C(x) ----> C(x) < 75

That means ----> The production cost is under $75,000

For the interval (34.18,39.87] -----> 34.18 < x\leq 39.87

The value of C(x) ----> C(x) < 75

That means ----> The production cost is under $75,000

Remember that the variable x (number of tires) cannot be a negative number

therefore

If the company wants to keep its production costs under $75,000 a reasonable domain for the constraint x is

0 ≤ x < 1.12 and 34.18 < x ≤ 39.87

7 0
3 years ago
Which value of a in the exponential function below would cause the function to stretch?
lesya692 [45]

Answer:

51251552 | \sqrt[ { {).5644}^{2} }^{25} ]{051} |

hhkhgguiffhkjgilkgfgkhff

8 0
3 years ago
Read 2 more answers
Other questions:
  • Please math help both please real quick , god bless
    10·1 answer
  • Sum of finite geometric series three triangles
    6·1 answer
  • Given A = {a, b, c}, how many subsets does A have including ∅?<br> a. 4<br> b. 7<br> c. 8
    6·1 answer
  • Tammy bought two rolls of tape. The first roll had 4.8 feet of tape and the second roll had 9.87 feet of tape. How many feet of
    10·1 answer
  • PLEASE HELPPPP !!!!!!!!!
    14·2 answers
  • Can somebody do this budget form for me?
    15·1 answer
  • See image for details on question
    6·1 answer
  • Uniform supply accepted a 4800 90 day 10%
    10·1 answer
  • use the order of operations to simplify the left side of the inequality below. What values of x make the inequality a true state
    15·1 answer
  • Answer this. pleaaaaseeee
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!