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
Leto [7]
3 years ago
11

When p = 12, t = 2, and s = 1/6, r = 18. If r varies directly with p and inversely with the product of s and t, what is the cons

tant of variation?
A: 1/8

B: 1/2

C: 4 1/2

D: 18
Mathematics
1 answer:
Ilia_Sergeevich [38]3 years ago
3 0
R = kp/st
18 = 12k/(1/6 x 2)
18 = 12k/(1/3)
18 = 36k
k = 18/36 = 1/2

You might be interested in
What is the square root of 30 to two decimal places
bonufazy [111]

Answer:

30.0

Step-by-step explanation:

7 0
3 years ago
In studies for a​ medication, 3 percent of patients gained weight as a side effect. Suppose 643 patients are randomly selected.
timofeeve [1]

Part a)

It was given that 3% of patients gained weight as a side effect.

This means

p = 0.03

q = 1 - 0.03 = 0.97

The mean is

\mu  = np

\mu = 643 \times 0.03 = 19.29

The standard deviation is

\sigma =  \sqrt{npq}

\sigma =  \sqrt{643 \times 0.03 \times 0.97}

\sigma =4.33

We want to find the probability that exactly 24 patients will gain weight as side effect.

P(X=24)

We apply the Continuity Correction Factor(CCF)

P(24-0.5<X<24+0.5)=P(23.5<X<24.5)

We convert to z-scores.

P(23.5 \: < \: X \: < \: 24.5) = P( \frac{23.5 - 19.29}{4.33} \: < \: z \: < \:  \frac{24.5 - 19.29}{4.33} ) \\  = P( 0.97\: < \: z \: < \:  1.20) \\  = 0.051

Part b) We want to find the probability that 24 or fewer patients will gain weight as a side effect.

P(X≤24)

We apply the continuity correction factor to get;

P(X<24+0.5)=P(X<24.5)

We convert to z-scores to get:

P(X \: < \: 24.5) = P(z \: < \:  \frac{24.5 - 19.29}{4.33} )  \\ =   P(z \: < \: 1.20)  \\  = 0.8849

Part c)

We want to find the probability that

11 or more patients will gain weight as a side effect.

P(X≥11)

Apply correction factor to get:

P(X>11-0.5)=P(X>10.5)

We convert to z-scores:

P(X \: > \: 10.5) = P(z \: > \:  \frac{10.5 - 19.29}{4.33} )  \\ = P(z \: > \:  - 2.03)

= 0.9788

Part d)

We want to find the probability that:

between 24 and 28, inclusive, will gain weight as a side effect.

P(24≤X≤28)=

P(23.5≤X≤28.5)

Convert to z-scores:

P(23.5  \:  <  \: X \:  <  \: 28.5) = P( \frac{23.5 - 19.29}{4.33}   \:  <  \: z \:  <  \:  \frac{28.5 - 19.29}{4.33} ) \\  = P( 0.97\:  <  \: z \:  <  \: 2.13) \\  = 0.1494

3 0
3 years ago
Help on this math questions please!
padilas [110]

Answer:

y =  - 3 {x}^{2} ( {x}^{2}  + 8x + 15) =  \\  =- 3 {x}^{2} ( (x + 3)(x + 5))  \\ roots \\ 0 \\  - 3 \\  - 5

6 0
2 years ago
Anyone wanna help with this iready question?
Illusion [34]

Answer:

3 ticket = 21 $

5 ticket = 35$

so 1 ticket = 7$

9 ticket = 63$

2$ discount

total amount = 61$

Mark my answer as brainlist answer.

7 0
2 years ago
For what interval(s) is the function negative?
serious [3.7K]

Answer:

The negative regions of a function are those intervals where the function is below the x-axis. It is where the y-values are negative (not zero). y-values that are on the x-axis are neither positive nor negative. The x-axis is where y = 0.

Step-by-step explanation:

7 0
2 years ago
Other questions:
  • Francis has 425 plants she plans an even amount over 47 Acres how many plants does she have to take home?
    13·1 answer
  • Of the 480 students at lincoln middle school one third have traveled overseas of these 15% have been to australia how many stude
    12·1 answer
  • A local grocery store has plans to construct a rectangular parking lot that is bordered on one side by a highway. there are 1280
    15·1 answer
  • Evaluate the function f(x) =1/2 x + 3<br> ASAP
    14·1 answer
  • Darla has 3 times as many penciled as lucy. darla had 27 how many pencils does lucy have .
    14·2 answers
  • Find the vertex of the parabola y = 2x2 + 10x + 8
    6·1 answer
  • 75 is 18 1/2 more than a number​
    5·1 answer
  • I need help ASAP plz
    12·2 answers
  • What is the simplified form of (-3xy)(5xy-1)?
    6·1 answer
  • Juan is three times as old as Gabe and Gabe is six years older than Catherine. If the sum of their ages is 149, how old is each
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!