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3 years ago

13

To get ready for a field trip students and adults were put into groups.for every 8 students in group there were 3 adults.in tota

l ,in all the groups there were 48 students .how many adults were also on the field trip?

1 answer:

loris [4]3 years ago

6 0

18 adults because 48/8=6, so 6x3=18.

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Andrew has three times as many pencils as Noah and five pens he has 17 pens and pencils altogether how many pencils does Noah ha

Novay_Z [31]

9514 1404 393

Answer:

4

Step-by-step explanation:

The distributive property does not appear to be involved in this question.

Let n represent the number of Noah's pencils. Then Andrew's total is ...

3n +5 = 17

3n = 12 . . . . . subtract 5 from both sides

n = 4 . . . . . . divide both sides by 3

Noah has 4 pencils.

7 0

2 years ago

2a + 4b + c =5 <br> x =-2 <br><br> a - 4b = -6<br> y=1

cricket20 [7]

There is no solution ,<span>a+c=-10;b-c=15;a-2b+c=-5 </span>No solution System of Linear Equations entered : [1] 2a+c=-10 [2] b-c=15 [3] a-2b+c=-5 Equations Simplified or Rearranged :<span><span> [1] 2a + c = -10 </span><span> [2] - c + b = 15 </span><span> [3] a + c - 2b = -5 </span></span>Solve by Substitution :

// Solve equation [3] for the variable c

<span> [3] c = -a + 2b - 5 </span>

// Plug this in for variable c in equation [1]

<span><span> [1] 2a + (-a +2?-5) = -10 </span><span> [1] a = -5 </span></span>

// Plug this in for variable c in equation [2]

<span><span> [2] - (-? +2b-5) + b = 15 </span><span> [2] - b = 10 </span></span>

// Solve equation [2] for the variable ?

<span> [2] ? = b + 10 </span>

// Plug this in for variable ? in equation [1]

<span><span> [1] (? +10) = -5 </span><span> [1] 0 = -15 => NO solution </span></span><span>No solution</span>

3 0

3 years ago

Use the order of operations to evaluate -(3 2) 2 + 4 * 3 - 2

LenaWriter [7]

So first remember the order of operations. Parentheses, exponents, multiply, divide, addition, subtraction.

So we have the following problem.

-(3*2)2+4*3-2

Multiply the three and two inside the parentheses first.

-6*2+4*3-2

Next multiply any numbers that need multiplied.

-12+12-2

Next add and subtract from left to right to get an answer of...

-2

Hope this helps!

4 0

3 years ago

Researchers are interested in the effect of a certain nutrient on the growth rate of plant seedlings. Using a hydroponics grow p

Ede4ka [16]

Answer:

1) The mean calculated for this case is $\bar X=61.5$

2) $61.5-5.4=56.1$

3) $61.5+5.4=66.9$

4) B. An interval estimate gives us a sense of the accuracy of the point estimate whereas a point estimate alone does not.

Because with the confidence interval we know the confidence level of the interval, and the limits for the parameter at some significance level.

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

Part 1

In order to calculate the mean and the sample deviation we can use the following formulas:

$\bar X= \sum_{i=1}^n \frac{x_i}{n}$ (a)

$s=\sqrt{\frac{\sum_{i=1}^n (x_i-\bar X)}{n-1}}$ (b)

The mean calculated for this case is $\bar X=61.5$

The sample deviation calculated $s=5.143$

$\mu$ population mean (variable of interest)

n=6 represent the sample size

Part 2

The confidence interval for the mean is given by the following formula:

$\bar X \pm ME$ (1)

So if we have the margin of error 5.4mm we can find the lowr limit like this:

$61.5-5.4=56.1$

Part 3

$61.5+5.4=66.9$

Part 4

B. An interval estimate gives us a sense of the accuracy of the point estimate whereas a point estimate alone does not.

Because with the confidence interval we know the confidence level of the interval, and the limits for the parameter at some significance level.

4 0

3 years ago

Read 2 more answers

What is 2/3 multiplied by 3/4 simplified? I need step by step to get answer.

Masteriza [31]

You start with the top number of each fraction and multiply them. So 2x3=6. Next you take the bottom number and multiply. So 3x4=12. That would give you a fraction of 6/12. 6 is half of 12 so 6/12 simplified is equal to 1/2. Hope this helps!

3 0

3 years ago