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Soloha48 [4]
3 years ago
10

I NEED HELP IM LATE PLEASE

Mathematics
1 answer:
Inga [223]3 years ago
3 0

Answer:

9x, 8x+12

Step-by-step explanation:

x(2x+7)-2x(x-1)

=> 9x

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A jeweler has 5 rings, each weighing 12 g, made of an alloy of 20% silver and 80% gold. She decides to melt down the rings and a
Aleksandr [31]

We have been given that a jeweler has 5 rings, each weighing 12 g, made of an alloy of 20% silver and 80% gold.

Upon melting all 5 rings, the weight of the material will be 12*5=60 grams.

We have been given that the alloy contains 20% silver and 80% gold. Further, let us assume that x grams of silver are added to the melted material so that it has 64% gold and 36% silver.

Therefore, we can set up an equation:

\text{Amount of gold before mixing}=\text{Amount of gold after mixing}

Therefore, we get an equation:

80\%\text{ of 60 gram}=64\%\text{ of (x+60) gram}

0.80*60=0.64(x+60)\\48=0.64x+38.4\\0.64x=9.6\\x=\frac{9.6}{0.64} \\x=15

Therefore, 15 grams of silver must be added to the melted material in order to reduce the gold content to 64%.

3 0
3 years ago
Please help me im gonna have to do this over again if i get it wrong
frez [133]
<h2><u>✎ </u><u>Answer:</u></h2>

<u />1\frac{1}{2} batches

➛➛➛➛➛

\frac{1/2}{1} =\frac{3/4}{x}

\frac{1}{2} =\frac{3}{4x}

cross~multiply

4x=2(3)

\frac{4x}{4} =\frac{6}{4}

x=\frac{3}{2} =1\frac{1}{2}

<h3>✂----------------</h3><h3>hope it helps...</h3><h3>have a great day!!</h3>
3 0
3 years ago
What is 11 divided by 20
zhannawk [14.2K]
11 divided by 2 is 5.5
5.5 divided by 10 is 0.55
8 0
3 years ago
Jack works after school. Each day he is paid a set amount, plus an hourly wage. Look at the table.
lapo4ka [179]

Answer:

2.5 Plus 40 hours only because is haft hours

8 0
3 years ago
A bicycle has a listed price of $544.98 before tax. If the sales tax rate is 9.75%, find the total cost of the bicycle with sale
CaHeK987 [17]

Answer:

$598.12.

Step-by-step explanation:

First you need to make the percent into a decimal and multiply it by the price without tax: 0.0975 · 544.98, which equals 53.136 when rounded to the nearest thousandth. This means that 53.136 is 9.75% of 544.98. Then you just need to add 53.136, or 53.14 when rounded, to 544.98. This gives you $598.12.

6 0
3 years ago
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