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3 years ago

David conducted a study of how many college students consume coffee everyday. What type of study is this and why?

1 answer:

7 0

Answer: David conducted (an observational study) because (it studies human behavior) and (the sample is not manuipulated).

Step-by-step explanation:

hope this helps! (:

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Mary is making some shirts for her school's drama department. The fabric store has 3 1/6 yards of the fabric she wants in stock.

ddd [48]

The answer is 4 3/4 yards of the fabric.

This can be calculated using the proportion.
If the 3 1/6 yards of the fabric is enough for 1 1/3 shirts, how many yards are necessary of 2 shirts:
 $3 \frac{1}{6} yards :1 \frac{1}{3}shirts =xyards:2shirts$

Let's express 3 1/6 as 19/6:
$3 \frac{1}{6} =3+ \frac{1}{6} = 3* \frac{6}{6}+ \frac{1}{6} = \frac{18}{6} + \frac{1}{6} = \frac{18+1}{6} = \frac{19}{6}$

Similarly, 1 1/3 = 4/3:
$1 \frac{1}{3} =1+ \frac{1}{3} = 1* \frac{3}{3}+ \frac{1}{3} = \frac{3}{3} + \frac{1}{3} = \frac{3+1}{3} = \frac{4}{3}$

Now, let's use this in the proportion:
 $3 \frac{1}{6} yards :1 \frac{1}{3}shirts =xyards:2shirts$
 $\frac{19}{6} : \frac{4}{3} = x:2$

Crossing the products:
$x* \frac{4}{3} =2* \frac{19}{6}$
⇒ $x* \frac{4}{3} = \frac{19}{3}$
⇒ $x = \frac{19}{3} : \frac{4}{3}$
$x= \frac{19}{3} * \frac{3}{4}$
⇒ $x = \frac{19}{4} = \frac{16+3}{4} = \frac{16}{4} + \frac{3}{4} =4+ \frac{3}{4} =4 \frac{3}{4}$

Therefore, Mary needs in total 4 3/4 yards of the fabric.

6 0

3 years ago

Read 2 more answers

Circle the staement below 1530 and 12530

Margaret [11]

Answer:

1530 < 12530

Step-by-step explanation:

i12530 is a bigger number than 1530

8 0

3 years ago

Read 2 more answers

A bag of flour weighs 50 2/3 kg what is the total weight of 10 bag

e-lub [12.9K]

Answer:

$506 \frac{2}{3} kg$

Step-by-step explanation:

50 2/3=

50×2+3/3

=152/3 kg

next 152/3 ×10

=1520/3

=506 2/3

4 0

2 years ago

One factor of f(x) = x3 − 14x2 + 61x − 84 is (x − 7). What are the zeros of the function?

lidiya [134]

Answer:

7, 4, 3

Step-by-step explanation:

Using Descartes' rule of signs, you can determine there are zero negative real roots. The above answer choice is the only one with no negative zeros listed.

_____

The count of negative real roots is based on the number of sign changes when the signs of odd-degree terms are reversed. Doing that gives the signs of the terms as - - - -, so there are no changes. That means there are no negative real roots.

A graphing calculator confirms this choice.

6 0

3 years ago

Read 2 more answers

Which expression calculates the speed in meters per second of an object that travels a distance of 40 m every 10 s?

RideAnS [48]

Speed = distance/time

So speed = 40/10

= 4m/s

3 0

3 years ago