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Travka [436]
3 years ago
6

In a school experiment the temperature of a substance is changed from 42 degrees F to -54 degrees F at an average rate of 12 deg

rees per hour. Over how many hours does the change take place?
Mathematics
1 answer:
mixas84 [53]3 years ago
5 0

Answer: 8 Hours


(42--54)/12=8

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You have a large container of mustard oil.You have used 480 quarts of oil. 76% of the oil remains. How many quarts remain?
DiKsa [7]
The best approach to take here is to find out what 1% and 10% are, then multiply them accordingly. 
To find 10%, just divide the amount of quarts by 10.
480/10= 48
Therefore, 10% is 48 quarts.
To find 1%, you then divide the 10% by 10. 
48/10= 4/8
Therefore, 1% is 4.8 quarts.
As you're looking for 76, you can either multiply the 1% by 76, or you can break it down into two parts, which may be easier, which is the method that I will use.
I would split it into 70% and 6%
As you've got 10%, in order to find 70%, you just need to multiply this by 7.
48*7= 336.
you then need to find the odd 6%.
As you've find 1%, you need to then multiply this by 6.
4.8*6= 28.8
You then need to add these together to get your total.
336+28.8= 364.8
As you're looking for the remainder, you then need to take this away from 480.
480-364.8= 115.2
Therefore, you have 115.2 quarts of mustard oil remaining.
Hope this helps :)
5 0
3 years ago
Read 2 more answers
PLEASE HELP ME ASAP!!
Sophie [7]

I think that I'm an idiot

7 0
3 years ago
Use quadratic regression to find the
tigry1 [53]

Given:

The three points are (-7,134), (-3,10) and (5,50).

To find:

The equation of parabola using quadratic regression.

Solution:

The general equation of quadratic regression is

y=ax^2+bx+c ...(i)

The three points are (-7,134), (-3,10) and (5,50).

Using the graphing calculator, we get a=3, b=-1 and c=-20. Putting these values in (i), we get

y=3x^2+(-1)x+(-2)

y=3x^2-x-2

Therefore, the equation of parabola is y=3x^2-x-2 and the missing values in the given equation are 3, -1 and -20.

5 0
2 years ago
I need help please I have to finish this
myrzilka [38]

Hey there!

This diagram shows two parallel lines (they will never intersect). This lines are crossed by another line called a <u>transversal</u>. This simple diagram can help us understand the nature of angles in our world.

The most important number to think about when it comes to this diagram is 180. A full circle is 360 degrees, and half of that is 180. Let's say that you are opening a shoe box. With the lid closed, there is no angle. If you open the lid straight up so that there is an L-shape, you have made a right angle, which is 90 degrees. If you open it so that it makes a line, you are now at 180 degrees. If you were to open the lid in a full circle, that would be 360 degrees, but the lid would probably break off!

We see that a straight line is a 180 degree angle. This means that 3y and the angle on the other side of the transversal right next to it (we'll call this angle A) should add up to equal 180 degrees. Angles that add up to equal 180 degrees are called <u>supplementary angles</u>. Looking again, we see that angle A and the 87 degree angle make up a straight line, so they are also supplementary. If 3y is supplementary with angle A and angle A is supplementary with 87, then 3y must be equal to 87. 3y and 87 are known as vertical angles because they are vertical of each other and meet at a point. Vertical angles are always congruent, so 3y is 87. We can just divide 87 by 3 to figure out what y is: 29.

There are also corresponding angles. These are angles that are the exact same but are in different places. For example, angle 87 is going to be the same thing as the supplementary angle to the bottom left of 3x because they are both to the left of the transversal and below the parallel line. Therefore, 3x is supplementary with 87. If you subtract 87 from 180, then you get 93. We divide by 3 to get x, giving us 31.

So, x=31 and y=29.

I hope that this helps! Have a wonderful day! :D

7 0
2 years ago
Braille because of its size and detail, Braille takes longer to read than text. A person reading Braille reads and the rate of 2
larisa [96]

The relationship between the reading rate of text and Braille can be modeled in terms of t as B(t) = 0.25t

Let :

Text reading rate = t

<u>Braille reading rate can be expressed in terms of t thus</u> :

  • B(t) = 0.25t

<u>Therefore, we could make a proportional relationship table thus </u>:

t = 1

B(t) = 0.25(1) = 0.25

t = 2

B(t) = 0.25(2) = 0.5

t = 3

B(t) = 0.25(3) = 0.75

0.75t = 4

B(t) = 0.25(4) = 1

1 t = 5

B(t) = 0.25(5) = 1.25

Text reading rate, t ; 1 ____ 2 ___ 3 ____ 4 ____ 5

Braille reading rate ;0.25_0.50_0.75 __1.00 __1.25

Therefore, the graph of the relationship between text and braille reading rate is attached below.

Learn more :brainly.com/question/18904995

7 0
1 year ago
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