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djyliett [7]
3 years ago
15

Emily has a coupon for 20 percent off her purchase. She finds a backpack she likes on the discount rack. It’s original price is

$60, but everything on the rack comes with a 30 percent discount. Emily says, “thirty percent and twenty percent make fifty percent so ur will cost $30. Is emy correct?
Mathematics
1 answer:
Bas_tet [7]3 years ago
4 0
She’s incorrect I’m pretty sure u divide 20 and 60.
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If you measure a tds of 1.4%, and you used a brew ratio of 15, what is the percent extraction?
sweet-ann [11.9K]
Answer: the extraction is 18.2%.

Explanation:

Let's see few definitions:
TDS = Total Dissolved Solids = solids dissolved in the brew
PE = Percent Extraction = percent of solids extracted from the dry coffee grounds

The percent extraction can be calculated by the formula:
PE = TDS × Rm

where
Rm = ratio between the mass of the brew and the mass of dry grounds

Now, you need to consider the following facts:
1) every 1g of coffee absorbs 2g of water
2) the given brew ratio is 1:15, which means that for every 1g of grounds we use 15g of water

Let's call
x = grams of coffee grounds we want to use
Therefore the mass of the brew will be: 
m(brew) = water we use - water absorbed by the coffee
              = 15·x - 2·x
              = 13·x

Therefore,
Rm = m(brew) / x
       = 13·x / x
       = 13

Hence, the percent of extraction will be:
PE = <span> TDS × Rm
      = 1.4 </span>× 13
      = 18.2
4 0
3 years ago
A wheel has a radius of 15 cm. Approximately how far does it travel in 4 revolutions?
ArbitrLikvidat [17]
Radius is 15 cm
Circumference = 2 pi r
C = 2 x 3.14 x 15cm
C = 94.2 cm
94.2 cm x 4 (revolutions) = 376.8 = D
7 0
3 years ago
Yay! tysm guys for helping me on this test! i got a 85! :)
irakobra [83]

Answer:

Proud of you!! <3 :)

Step-by-step explanation:

8 0
2 years ago
What type of graph organizes data into 4 groups of equal size, and is often used to compare two sets of data.
aliina [53]

The plot that organizes the data into 4 groups of equal sizes is box and whisker plot.

The image below shows a box and whisker plot. Following are the elements of box and whisker plot:

Minimum = This is the smallest value of the data set

Q1 = First (Lower) Quartile of the data set. 25% of the data values lie below this point

Q2 = Second Quartile or Median. This is the central value so 50% of the data values lie below this point

Q3 = Third (Upper) Quartile of the data set. 75% of the data values lie below this point.

Maximum = This is the maximum value of the data set.

Based on box and whisker plot we can compare two or more sets of data by comparing the spread of the data. We can also directly observe from the box and whisker plot if the data is uniform, normal or skewed. Using box and whisker plot we can also visualize any outliers that may be in the data.

8 0
3 years ago
45 workers can complete a piece of work in 12 days.how many workers should be removed so that it takes 6 more days to complete t
nekit [7.7K]

Answer:

90

Step-by-step explanation:

8 0
2 years ago
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