All categories

1 year ago

10 gallons of gasoline costs $30. The cost of gasoline per gallon is

Mathematics

2 answers:

Evgesh-ka [11]1 year ago

8 0

Answer:

The cost per gallon is $3.

Step-by-step explanation:

10 = $30

1 = x

Cross multiply

$30*1 = 10*x

Divide through by 10

($30*1)/10 = (10*x)/ 10

($30*1)/10 = (10*x)/10

$30/10 = 10x/10

$3 = x

x= $3

Kipish [7]1 year ago

4 0

Answer:

10kahbsbdnieknababavaysisiee

You might be interested in

Jack’s first weight increased by 20% and then his new weight decreased by 25%. His final weight is what percent of his beginning

ElenaW [278]

Lets suppose his initial weight was 60 kilograms

A gain of 20% would make his new eight 60 + 20*60/100

= 60 + 12

= 72 kg

he lost 25% of this:-

= 72 - 25 * 72/100 = 54 kg

This = (54/60) * 100 = 90% of his beginning weight Answer

8 0

3 years ago

Which Point Below Lies In The Shaded Area Of The Graph? (Correct Answer-Gets 100 Points)

Artemon [7]

The answer for your question is B.(-3,2)

8 0

3 years ago

Read 2 more answers

Is 0.2775 a rational number

Cerrena [4.2K]

Answer:

yes it is

Step-by-step explanation:

It is a rational number, as it can be written as a fraction.

3 0

2 years ago

A programmer plans to develop a new software system. In planning for the operating system that he will use, he needs to estimat

erma4kov [3.2K]

Answer:

a) $n = 9604$

b) n = 381

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

The margin of error is:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

90% confidence level

So $\alpha = 0.1$ , z is the value of Z that has a pvalue of $1 - \frac{0.1}{2} = 0.95$ , so $Z = 1.645$ .

a. Assume that nothing is known about the percentage of computers with new operating systems. n = ?

When we do not know the proportion, we use $\pi = 0.5$ , which is when we are going to need the largest sample size.

The sample size is n when M = 0.01.

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

$0.01 = 1.96\sqrt{\frac{0.5*0.5}{n}}$

$0.01\sqrt{n} = 1.96*0.5$

$\sqrt{n} = \frac{1.96*0.5}{0.01}$

$(\sqrt{n})^{2} = (\frac{1.96*0.5}{0.01})^{2}$

$n = 9604$

b. Assume that a recent survey suggests that 99% of computers use a new operating system. n = ?

Now we have that $\pi = 0.99$ . So

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

$0.01 = 1.96\sqrt{\frac{0.99*0.01}{n}}$

$0.01\sqrt{n} = 1.96*\sqrt{0.99*0.01}$

$\sqrt{n} = \frac{1.96*\sqrt{0.99*0.01}}{0.01}$

$(\sqrt{n})^{2} = (\frac{1.96*\sqrt{0.99*0.01}}{0.01})^{2}$

$n = 380.3$

Rouding up

n = 381

7 0

3 years ago

7x_=(7x4)+(7x3) how do I solve this

Advocard [28]

Easy 7x3 is first then 7x4 then 7x5=7x_

7 0

3 years ago