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notka56 [123]
3 years ago
8

I have 8 9 and 10 To work on I need help on Those please

Mathematics
1 answer:
hram777 [196]3 years ago
5 0
9) area= pi times radius^2
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A merchant has coffee worth $20 a pound that she wishes to mix with 70 pounds of coffee worth $90 a pound to get a mixture that
Dvinal [7]

Let us start with assuming the amount of coffee worth $20 a pound to be "x" pounds.

Now she wants to mix "x" pounds of $20 coffee with 70 pounds of $90 coffee.

So the mixture would be (x + 70) pounds.

And the value of mixture would be = 20·x + (90)·(70) = (20x + 6300) dollars.

She want to sell this mixture at rate of $30 a pound. Her earning would be = 30·(x + 70) = (30x + 2100) dollars.

We know that the value of mixture would be equal to her earnings.

30x + 2100 = 20x + 6300

30x - 20x = 6300 - 2100

10x = 4200

x = 420

So, 420 pounds of $20 coffee would be used.

7 0
3 years ago
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ANSWER THIS QUESTION FOR BRAINLEST AND 10 POINTS
ivolga24 [154]

Answer:

I beleive that the answer is (1,2)

Step-by-step explanation:

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3 years ago
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Type of Ball football basketball baseball softball
crimeas [40]

Answer:

1.-  He received 388 dollars in exchange.

2.-(100 x 4) - (7.00 + 5.00)

= 400 - 12

= 488

3.-  I buy 15 basketballs.

And I buy 6 soccer balls.

4.-  (135 ÷ 9) (48 ÷ 8)

= 15, 6

Step-by-step explanation:

I hope I have helped you can you put that this is the smartest answer please?

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3 years ago
As the music plays,the volume changes In the beginning of the piece can be modeled by the equation s=10Ix-4I+50 where s represen
Ipatiy [6.2K]

Answer:

-127

Step-by-step explanation:

s = 101x-41+50

80 = 101x - 4+ 50

-101x

-181 = x - 4 +50

-181 = x -54

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-127 = x

I hope this helps

8 0
3 years ago
Find the slope of this line
Yanka [14]

Answer:

Undefined (DNE)

Step-by-step explanation:

Any vertical line has an undefined slope.

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