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2 years ago

If 1/10 of a scarf is knit in 48 minutes.what fraction of a scarf is knit in 1 hour

Mathematics

1 answer:

Andrew [12]2 years ago

4 0

Answer:

1/8

Step-by-step explanation:

i believe this is the answer

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2.) If z varies inversely as r, and z= 24 when r = 6, find r when z= 12

Schach [20]

Step-by-step explanation:

........ .......... ....

7 0

2 years ago

Jenny's bakery sells carrot muffins at 2 dollars each. The electricity to run the over is over 120 dollars per day and the cost

g100num [7]

Answer:

200 muffins

Step-by-step explanation:

The selling price of each muffin = $2

The cost price of each muffin = $1.40

The price of electricity = $120

If the number of muffins that Jenny sells in a day is x, then, Jenny's total cost in a day is:

120 + (1.4 * x) = 120 + 1.4x

and the total sales earnings in a day for x muffins will be:

2 * x = 2x

To break even, the total costs in a day must equal to the total earnings. That is;

$2x = 120 + 1.4x$

Solving this:

$2x - 1.4x = 120\\\\\\0.6x = 120\\\\\\x = 120/0.6\\\\\\x = 200$

She must sell 200 muffins in a day to break even.

7 0

3 years ago

A research engineer for a tire manufacturer is investigating tire life for a new rubber compound and has built 16 tires and test

frutty [35]

Answer:

The 95% confidence interval for mean tire life is between 52,368.4 kilometers and 67,911 kilometers.

Step-by-step explanation:

We are in posession of the sample's standard deviation, so we use the students t-distribution to solve this question.

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 16 - 1 = 15

95% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 15 degrees of freedom(y-axis) and a confidence level of [tex]1 - \frac{1 - 0.95}{2} = 0.975. So we have T = 2.68

The margin of error is:

M = T*s = 2.1315*3645.94 = 7771.3

In which s is the standard deviation of the sample.

The lower end of the interval is the sample mean subtracted by M. So it is 60139.7 - 7771.3 = 52,368.4.

The upper end of the interval is the sample mean added to M. So it is 60139.7 + 7771.3 = 67,911.

The 95% confidence interval for mean tire life is between 52,368.4 kilometers and 67,911 kilometers.

3 0

3 years ago

Read 2 more answers

Is this righttt????<br><br><br><br> Huh

oksano4ka [1.4K]

Answer:

Should be!!! i remember taking that quiz but i dont really remember

Step-by-step explanation:

6 0

3 years ago

Read 2 more answers

Which of the following is a solution of y - x > -3? (6, 2) (2, 6) (2, -1)?

SVEN [57.7K]

Hello :
(2, 6) is a solution of y - x > -3 because : 6-2> -3 ..... 4 > -3

7 0

3 years ago