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Mkey [24]
3 years ago
11

This equation shows how the cost of a plumber's visit is related to its duration in hours. c = 24.9d + 11.4 The variable d repre

sents the duration of the visit in hours, and the variable c represents the cost. What is the duration, in hours, of a plumber's visit that costs $31.32?
Mathematics
1 answer:
kozerog [31]3 years ago
8 0
The correct answer would be 8/10 of an hour or 48 minutes.

To solve this, you would plug in the 31.32 into the cost. You would then subtract 11.4 from both sides to isolate the d term. You would then be left with 19.92=24.9d. You would then divide both sides by 24.9, to solve for the d term, and you would get d=.8
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baherus [9]

Answer:

2

Step-by-step explanation:

rise over run = y/x

3/1.5= 2

8 0
3 years ago
The claim is that the proportion of adults who smoked a cigarette in the past week is less than 0.30​, and the sample statistics
IrinaK [193]

Answer: 0.84

Step-by-step explanation:

let p be the population proportion of adults who smoked a cigarette in the past week.

As per given , we have

H_a: p

Sample size : n= 1491

The sample proportion of adults smoked a cigarette= \hat{p}=\dfrac{x}{n}=\dfrac{462}{1491}=0.30985915493\approx0.31

The test statistic for proportion is given by :-

z=\dfrac{\hat{p}-p}{\sqrt{\dfrac{p(1-p)}{n}}}

Substitute all the values , we get

z=\dfrac{0.31-0.30}{\sqrt{\dfrac{0.30(1-0.30)}{1491}}}\\\\=\dfrac{0.01}{\sqrt{0.000141}}\\\\=\dfrac{0.01}{0.011874342087}=0.84261497731\approx0.84

Hence, the value of the test statistic = 0.84

6 0
3 years ago
Can someone please help me I can’t afford to get anymore wrong
yuradex [85]
You answer would be B. Vehicle B needs fewer repairs then Vehicle A on average and its repair rate is more consistant
3 0
3 years ago
Please help me!!! Alot of points!!
Dafna11 [192]
Let C represent the temperature in Celsius, and let F represent the temperature in Fahrenheit.

F=1.8C+32

Using that equation, plug in the numbers. F=1.8*25+32. F=77
4 0
2 years ago
Read 2 more answers
Solve the equation: <br> 2x + B= C<br><br> X=
Angelina_Jolie [31]
Add (-2X) to both sides:
2X + B + (-2X) = C + (-2X)
If we (rearrange) it into B + 2X + (-2X) = C + (-2X)
B + 2X - 2X = C + (-2X)
Since +2X - 2X = 0
B + 0 = C + (-2X)
B = C + (-2X)
B = C - 2X
6 0
3 years ago
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