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Shkiper50 [21]
3 years ago
5

3(0.3x +1.3) = 2(0.4x -0.85)

Mathematics
1 answer:
Verdich [7]3 years ago
5 0

Answer:

Step-by-step explanation:

3(0.3x + 1.3) = 2(0.4x - 0.85)

0.9x + 3.9 = 0.8x - 1.70

0.9x - 0.8x = - 1.70 - 3.9

0.1x = - 5.6

x = - 5.6 / 0.1

x = - 56

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Why is the answer B?
Radda [10]

Remark

Whatever the original price, he gets 70% in the first instance.

He gets 80% in the second instance.

He gets 90% in the third instance

His total income is 240 dollars.

Let the original price be x

Equation

70%x + 80%x +90%x = 240

70% = 0.7 ; 80% = 0.8 ;90% = 0.9

Solution

0.7x + 0.8x + 0.9x = 240 Take out x as a common factor and add the decimals.

x (0.7 + 0.8 + 0.9) = 240

2.4x = 240 Divide both sides by 2.4

x = 240/2.4

x = 100

So the watches should have brought in 3*100 = 300 dollars.

He only brought in 240 dollars.

He lost 300 - 240 = 60 dollars.

The answer is B.

7 0
2 years ago
What is the slope of the line that passes through the points (3, -2) and (9, -2)?
Step2247 [10]

Answer:

0 or 0/6

Step-by-step explanation:

3+6=9

-2+0=-2

0/6=0

6 0
3 years ago
Help please. I don’t understand and my teacher didn’t bother to teach us any of this and my brain hurts!!!!
const2013 [10]

Answer:

  23.  42 m^2

  24.  144 ft^2

  25.  68 cm^2

Step-by-step explanation:

The teacher should not need to spend any time teaching this. The area of the total figure is the sum of the areas of its parts. You already know that. And, you already know how to compute the areas of triangles and rectangles.

__

You may recall that the area of a triangle is ...

  A = 1/2bh

and the area of a rectangle with the same base and height is ...

  A = bh

So, a triangle with base b and height h has the same area as a rectangle with the same base (b) and half the height (h/2). Recognizing this makes these problems really simple.

__

23. The base of the rectangle and triangle is 7 m. The height of the triangle is 4 m, so its area is equivalent to adding 4/2 = 2 m to the 4 m height of the rectangle. Then the total area is ...

  A = (7 m)(4 m +(1/2)(4 m)) = (7 m)(6 m) = 42 m^2

__

24. Since there are two identical triangles of height 5, their total area is equal to that of a rectangle of height 5.

  A = (12 ft)(7 ft +5 ft) = 144 ft^2

__

25. The 5 cm height of the triangle makes it have an area equivalent to a rectangle 5/2 cm high.

  A = (8 cm)(6 cm +5/2 cm) = 68 cm^2

Note: we have read the fuzzy numbers as 8 cm wide, 6 cm high for the rectangle, and 5 cm high for the triangle. If your figure is different, please use the appropriate numbers in the calculation.

8 0
3 years ago
Clarissa bought 3 cartons of milk for y cents each she gave the cashier $10. How much change did she receive? Express your answe
e-lub [12.9K]

Answer:

The amount of change she received was (10-0.03y) dollar.

Step-by-step explanation:

Price of each carton of milk is  y cents and she bought 3 cartons of milk.

We know that, <u>1 dollar = 100 cents</u>

So,  1 cent = \frac{1}{100}=0.01 dollar.

and  y cents =0.01y dollar.

Thus, <u>the total price of 3 cartons of milk</u> =(0.01y*3)=0.03y dollar.

She gave the cashier $10.

So, the amount of change she received =(10-0.03y) dollar.

8 0
2 years ago
An 8-car Ferris wheel is shaped like a regular octagon. Does the Ferris wheel have rotational symmetry?
VikaD [51]

Answer:

Yes, it does.

Step-by-step explanation:

Every regular shaped figure will have rotational symmetry, since they are built with identical segments all around.

To find the answer, ask yourself « If I rotate the shape, is there a time where I’ll find the exact same shape again with a different angle? »

So, a square has rotational symmetry, but not a rectangle.

A equilateral triangle has rotational symmetry, but not any other type of triangle.

4 0
3 years ago
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