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DaniilM [7]
3 years ago
13

An art school charges a materials fee in addition to a fee per class. The equation below represents the total cost of y after x

classes.
y=40x- 25

How many dollars is the fee for one class?
Mathematics
1 answer:
Olin [163]3 years ago
7 0
Hi there!

To find the amount of money needed for one class, we need to plug 1 into the equation as x, since x represents the amount of classes.

y = 40(1) - 25
y = 40 - 25
y = 15

So, it would cost 15 dollars.

Hope this helps!
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Calculate the percentage change (increase or decease) that occurs when:
SashulF [63]

The first step is to find the CHANGE. This is done by subtracting the two values and taking the absolute value. Next step is to find the ratio of the change to the original and multiplying by 100% to make it a percentage.

So;

a)  change = Ι60 - 25Ι = 35.

     ratio of change to original = 35:25,

    multiplying by 100% will give 35/25 × 100% = 140%.

    Hence it is a 140% INCREASE.

b) change = | 30 - 66 | = 36

    the ratio is 36:66

multiplying by 100% = 36/66 × 100% = 0.545454... ×100% ≈ 54.5%

   Hence it is a 54.5% DECREASE.


Helpful?

     



4 0
3 years ago
650 marked down to 475 what is the percent markdown
Aleksandr [31]
I'm not really sure, because 650 marked down by 27% would be 474.5, which is close but not exact.

Hope I helped a little bit, sorry if I'm wrong.
8 0
3 years ago
What is overlapping set​
Westkost [7]

Answer:

two sets are said to be overlapping if they contain at least one element in common A=(1,2,3,4)and B =(4,7,1,9)are said to be overlapping sets.

Step-by-step explanation:

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(xii) NH₂ + Cl₂ →→→→NH₂CI+ N₂

(xiv) NaOH + Cl₂ →→ NaCl + NaCIO + H₂O

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xviii) C₂H₂ + O₂2 CO₂ + H₂O

(xx) Na + H₂O → NaOH + H₂

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6 0
3 years ago
5x + 7 - 2(-8x -1) = 7(x - 1)
love history [14]

Step-by-step explanation:

5x + 7 - 2( - 8x - 1) = 7(x - 1)  \\ 5x + 7 + 16x + 2 = 7x - 7 \\ collecting \:  like \:  \: terms \:  \\ 5x + 16x - 7x =  - 7 - 2 - 7 \\ 14x =  - 16 \\ divide \: both \: side \: by \: 14 \\  \frac{14x}{14}  =  \frac{ - 16}{14}  \\ x =   - \frac{ 8}{7}

8 0
3 years ago
If $1600 earned simple interest of $56.24 in 2 months, what was the simple interest rate? The simple interest rate is % (Do not
Fiesta28 [93]

Answer:

\$21.1

Step-by-step explanation:

We know that for principal amount P , time period T and rate of interest R\% , simple interest is given by S.I. = \frac{P\times R\times T}{100} .

Here ,

P=\$1600\\T=2\,\,months=\frac{2}{12}\,\,years=\frac{1}{6}\,\,years\\S.I=\$56.24

To find :  simple interest rate i.e., R\%

On putting values of P\,,\,T\,,\,S.I in formula , we get S.I. = \frac{P\times R\times T}{100}

56.24 = \frac{1600\times R\times 1}{600}\\R=\frac{56.24\times 600 }{1600}=\frac{703\times 3}{100}=\$21.09

Now we need to round off the answer to the nearest tenth .

So, simple interest rate is % = \$21.09 = \$21.1

8 0
3 years ago
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