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IgorLugansk [536]
2 years ago
13

Amaryn bought 8 notebooks. each notebook is 12.78 Amaryn paid 5.99 for shipping

Mathematics
1 answer:
Anit [1.1K]2 years ago
7 0

Answer:

108.23

Step-by-step explanation:

8*12.78=102.24+5.99= 108.23

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Maria sold 20 shares of stock for a total of $2980. what was the value of one share?
belka [17]
Nice and simple. I'll explain it to you, not just give the answer.

Now, 20 shares = 2980, lets make shares = x, which means it turns to

20x = $2980

Now, you'd simply solve for X, which is done by dividing 2980 by 20, which gets you
 
x = 149 (cost of one share)
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2 years ago
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valentinak56 [21]

Answer: 1/4

Step-by-step explanation:

3 0
3 years ago
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A chemist has one solution that has 50% acid. She has another solution that is 25% acid. How many liters of the 50% acid solutio
Tatiana [17]

Answer:

Step-by-step explanation:

Let's begin by assigning letters to represent our two unknowns:

   x (liters of 25% solution)

   y (liters of 50% solution)

 

Our system of equations will consist of two equations:

   Equation #1 (total volume of solution)

   Equation #2 (total concentration of acid)

 

Our total volume of solution is 10 liters, which can be expressed as the sum of our unknowns:

   Equation #1:  x + y = 10

 

Our total concentration of acid can be expressed as the sum of the individual acid concentrations to make up the concentration of the final solution:

   Equation #2:  (0.25)(x) + (0.50)(y) =

                            (0.40)(10)

 

We can use Equation #1 to express one unknown in terms of the other and then plug that expression into Equation #2 to solve for one of the unknowns:

   x + y = 10

         y = 10 - x

 

Now we'll plug our expression for y in terms of x into Equation #2 and solve for x:

   0.25(x) + 0.50(10 - x) = 0.40(10)

   0.25x + 5 - 0.50x = 4

   -0.25x = 4 - 5

   -0.25x = -1

          x = (-1)/(-0.25)

          x = 4 (liters of 25% solution)

 

Now we'll plug our value for x into Equation #1 and solve for y:

   4 + y = 10

         y  = 10 - 4

         y = 6 (liters of 50% solution)

 

Finally, we will verify the correctness of our answers by plugging these values into Equation #2 to see if the sum of the component acid concentrations equals the final solution concentration:

   0.25(4) + (0.50)(6) = 0.40(10)

   1 + 3 = 4

         4 = 4 (our answers are correct)

8 0
2 years ago
The given lengths are two sides of a right triangle. All three side lengths of the triangle are integers, and together they form
mel-nik [20]
The correct answer is “A” 40,leg
8 0
3 years ago
Plzzz helpppp itssss urgentt!!!!!!!!
azamat

Answer:

4) 40 Square inches

Step-by-step explanation:

You do 2 x 4 then divide by 2. after that you multiply by 4.  Then you add the square which is 2 x 2

6 0
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