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maksim [4K]
3 years ago
7

The school band has a goal of raising $800 for some new uniforms. If they have raised $512 so far, what percent of their goal ha

ve they raised?
Mathematics
2 answers:
kolbaska11 [484]3 years ago
8 0

Answer:

64%

Step-by-step explanation:

uranmaximum [27]3 years ago
3 0
64% divide 512 by 800
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Step-by-step explanation:

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Calculate the perimeter of the following shape.<br>6cm<br>y=<br>10 cm<br>12 cm<br>5 cm​
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10 cm + 12 cm + 5 cm + 6 cm

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3 years ago
Consider the line y=5/7x+7. Find the equation of the line that is parallel to this line and passes through the point (-5,-2). Fi
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Step-by-step explanation:

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L;y-(-2)=5/7(x-(-5)

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There are 200 9th graders in the freshman class. 2/5 of the students are girls. How
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2 years ago
Rajan needs 1 liter of 15% hydrochloric acid solution for an experiment. He checks his storage cabinet, but he only has a 5-lite
Delvig [45]

Answer:

  1. <em>0.75</em><em> liters of 5% hydrochloric acid solution </em>
  2. <em>0.25</em><em> liters of 45% hydrochloric acid solution.</em>

Step-by-step explanation:

Let us assume that, x liters of the 5% hydrochloric acid and y liters of the 45% hydrochloric acid solutions are combined.

As Rajan need total of 1 liter of solution, so

x+y=1

i.e x=1-y --------------------1

As Rajan needs 5% hydrochloric acid and 45% hydrochloric acid to make a 1 liter batch of 15% hydrochloric acid, hence acid content of the mixture of two acids will be same as of the final one, so

0.05x+0.45y=1\times 0.15

i.e 5x+45y=15 -------------2

Putting value of x from equation 1 in equation 2,

\Rightarrow 5(1-y)+45y=15

\Rightarrow 5-5y+45y=15

\Rightarrow 5+40y=15

\Rightarrow 40y=15-5=10

\Rightarrow y=0.25

Putting the value of y in equation 1,

x=1-0.25=0.75

Therefore, Rajan must use 0.75 liters of 5% hydrochloric acid solution and 0.25 liters  of 45% hydrochloric acid solution.

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