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4 years ago

Sam needs to cut a piece of sheet metal into 8 pieces. It takes him 5 minutes to make each cut.

2 answers:

galina1969 [7]4 years ago

7 0

-- Cut the sheet in half.

-- Put one half-sheet on top of the other half-sheet.
Cut the stack of 2 halves in half.

-- Put one stack of two quarter-sheets on top of the other stack of quarter-sheets.
Cut the stack of 4 quarters in half.

Now you have eight one-eighth sheets.

Three cuts.
Taking Sam (3 x 5) = 15 minutes, plus a few seconds for set-up between cuts.

balandron [24]4 years ago

5 0

For #3, To make 8 pieces you have 7 cuts. 7*5=35 minutes

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In ________ research, the objective is to gather preliminary information that will help define the problem and suggest hypothese

Vanyuwa [196]

Answer:

Exploratory or Formulative research

Step-by-step explanation:

Generally, Exploratory or Formulative research is a type of research that considers all designs for a problem/study and chooses the best from all that has been considered. This is ensured by perusing literature backings that are available, first hand information from those with direct impact on the study and putting to use different theoretical techniques to ensure the best is gotten from such research.

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3 years ago

I'll give u branley: A recipe calls for 10 cups of flour to make 60 pancakes. How many pancakes can be made with a single cup of

Tatiana [17]

Answer: 6

Step-by-step explanation:

60/10 is 6

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3 years ago

Read 2 more answers

On a standard IQ test, the standard deviation is 15. How many random IQ scores must be obtained if we want to find the true popu

igor_vitrenko [27]

Answer:

We need at least 4238 scores.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.97}{2} = 0.015$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.015 = 0.985$ , so $z = 2.17$

Now, find the margin of error M

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

How many random IQ scores must be obtained if we want to find the true population mean (with an allowable error of 0.5) and we want 97 percent confidence in the results

We need at least n scores, in which N is found when $M = 0.5$ . So

$M = z*\frac{\sigma}{\sqrt{n}}$

$0.5 = 2.17*\frac{15}{\sqrt{n}}$

$0.5\sqrt{n} = 2.17*15$

$0.5\sqrt{n} = 32.55$

$\sqrt{n} = \frac{32.55}{0.5}$

$\sqrt{n} = 65.1$

$\sqrt{n}^{2} = (65.1)^{2}$

$n = 4238$

We need at least 4238 scores.

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4 years ago

In a class, 45 students are taking the SAT exam.The number of boys is 9 more than the number of girls.How many girls and boys ar

maxonik [38]

The equation would be
g + (g + 9) = 45
2g + 9 = 45
- 9
2g = 36
÷ 2
g = 18
18 + 9 = 27
Girls: 18
Boys: 27
Hope this helps! Let me know if you have any questions :)

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3 years ago

If an angle of 11pi/30 radian is in standard position. What is the reference angle in radian?

bixtya [17]

Answer:

$\frac{11\pi}{30}$

Step-by-step explanation:

The reference angle is an acute angle that angle in standard position makes with the positive x-axis.

The given angle in radians is

$\frac{11\pi}{30}$

This angle is already acute and hence it is itself a reference angle.

The reference angle of any angle in the first quadrant is the same angle.

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3 years ago