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AnnyKZ [126]
3 years ago
10

Help! I will mark you brianliest!

Mathematics
1 answer:
dimaraw [331]3 years ago
6 0

Answer:

first: $130

second: 165 miles

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How many liters of 10% alcohol solution and 5% alcohol solution must be mixed to obtain 40 liters of 8%
Likurg_2 [28]

Answer:

x+y=40liters

10%x+5%y=8%×40

(2x+y)/20=8%×40

(2x+y)=64

x=24

y=16

4 0
3 years ago
Which calculation could not be used to find the percentage change
bogdanovich [222]

Answer:

Option (B).

Step-by-step explanation:

Percentage change between two numbers a and b can be calculated by the formula,

% change = \frac{|b-a|}{a}\times 100

Where, (b - a) = Change in values

a = Initial value

If a = 16 and b = 20

Percentage change between 16 and 20 will be,

= (\frac{20-16}{16})\times 100

= \frac{4}{16}\times 100

= 25%

If a = 20 and b = 16,

Percentage change = \frac{|16-20|}{20}\times 100

                                 = 20%

Therefore, %change between 16 and 24 may be 16% or 20%.

Option (A),

\frac{20-16}{16}\times 100 = 25%

Option (B),

\frac{20}{16}-1\times 100 = 1.25 - 1 × 100

                   = 1.25 - 100

                   = -98.75%

Option (C),

100\times \frac{1}{4} = 25%

Option (D),

\frac{(20-16)}{20}\times 100 = 20%

Therefore, we can not use the calculation used in Option (B).

6 0
3 years ago
Hurry please
viva [34]

Answer:

It is tons

Step-by-step explanation: That is a weight measurement

5 0
3 years ago
19 ,20 ,21 please show your work (worth 100 points)
RoseWind [281]

Answer:

Step-by-step explanation:

19 - you would divide number of beads by beads per bracelet to get number of bracelets

blue = 258/6 = 43

silver = 428/9 = 47.56, round down because we're looking at complete bracelets = 47

rose = 102/3 = 34

white = 258/7 =36.86, round down again = 36

20 - they can make 43 + 47 + 34 + 36 = 160 bracelets before they run out, and they will run out of rose first since it has the smallest number of bracelets

21 - multiply num of beads by num of bracelets for each color and add them up

blue = 6 * 7 = 42

silver = 9 * 7 = 63

rose = 3 * 7 = 21

white = 7 * 7 = 49

42 + 63 + 21 + 49 = 175

5 0
3 years ago
Juan deposited $200 in savings account earning 3% interest over 2 years .
hoa [83]
I'm not too sure about this one but if you find 3% of $200 you get 6 and if you multiply that by 2 ( for the 2 years ) you'll get ( A $12 )
6 0
3 years ago
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