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s344n2d4d5 [400]
3 years ago
10

3x-5y=60 4x+5y=-4 what is the system of linear equation

Mathematics
1 answer:
Sergeu [11.5K]3 years ago
4 0

(3x-5y=60)

4x+5y=-4

3(8)-5(7.2)=60

4(8)+5(-7.2)=-4

7x=56

÷7. ÷7

x=8

3(8)-5y=60

4(8)+5y=-4

32+5y=-4

-32. -32

5y=-36

÷5. ÷5

y=7.2

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Prove that it is impossible to dissect a cube into finitely many cubes, no two of which are the same size.
solniwko [45]

explanation:

The sides of a cube are squares, and they are covered by the respective sides of the cubes covering that side of the big cube. If we can show that a sqaure cannot be descomposed in squares of different sides, then we are done.

We cover the bottom side of that square with the bottom side of smaller squares. Above each square there is at least one square. Those squares have different heights, and they can have more or less (but not equal) height than the square they have below.

There is one square, lets call it A, that has minimum height among the squares that cover the bottom line, a bigger sqaure cannot fit above A because it would overlap with A's neighbours, so the selected square, lets call it B, should have less height than A itself.

There should be a 'hole' between B and at least one of A's neighbours, this hole is a rectangle with height equal to B's height. Since we cant use squares of similar sizes, we need at least 2 squares covering the 'hole', or a big sqaure that will form another hole above B, making this problem inifnite. If we use 2 or more squares, those sqaures height's combined should be at least equal than the height of B. Lets call C the small square that is next to B and above A in the 'hole'. C has even less height than B (otherwise, C would form the 'hole' above B as we described before). There are 2 possibilities:

  • C has similar size than the difference between A and B
  • C has smaller size than the difference between A and B

If the second case would be true, next to C and above A there should be another 'hole', making this problem infinite. Assuming the first case is true, then C would fit perfectly above A and between B and A's neighborhood.  Leaving a small rectangle above it that was part of the original hole.

That small rectangle has base length similar than the sides of C, so it cant be covered by a single square. The small sqaure you would use to cover that rectangle that is above to C and next to B, lets call it D, would leave another 'hole' above C and between D and A's neighborhood.

As you can see, this problem recursively forces you to use smaller and smaller squares, to a never end. You cant cover a sqaure with a finite number of squares and, as a result, you cant cover a cube with finite cubes.

3 0
3 years ago
Ey can someone answer my question please cause i've posted it a few times and nothing happen
Arturiano [62]

Answer:

we could migrate here

Step-by-step explanation:

4 0
2 years ago
Read 2 more answers
What is a number written to the thousandths place that would relate to 417.91 using the = symbol?​
baherus [9]

Answer:

0.41791

Step-by-step explanation:

let x be the number written to the thousandth place then,

x times thousands = 417.91

or, x = 417.91/1000

therefore, x = 0.41791

and so

0.41791 thousand = 417.91

3 0
3 years ago
Read 2 more answers
Please help me out!! :D
Rudik [331]
T_n = a_1 + d(n - 1)


T_n = 52 + 12(n - 1)

T_n = 52 + 12n - 12

T_n = 40 + 12n

When n = 102,
T_{102} = 40 + 12(102) = 1264

Answer: 1264

7 0
3 years ago
3- There are 35 cubes in 7 bowls. How many cubes in 3 bowls?
Murrr4er [49]

Answer:

3. 15 Cubes

4. 60 ft per sec , 180 ft

5. 58 yards per min

6. $7.50, $18.00

Step-by-step explanation:

3. Number of Cubes in 7 bowls = 35

Number of Cubes in 1 bowls = \frac{35}{7}

Number of Cubes in 3 bowls =\frac{35}{7} \times 3 = 15

4. Distance ran by Zebra = 420 ft

Time taken = 7 seconds

Speed = \frac{Distance}{time}= \frac{420}{7}=60 ft per sec

Hence

Distance = speed x time

Distance covered in 30 seconds = 60 x 30 = 180 Ft

5. Distance travelled = 870 yards

Time taken = 15 mins

Speed =\frac{Distance}{time}= \frac{870}{15}=58 yards per min

6. Cost of 3 pounds of apple = $4.50

Cost of 1 pounds of apple = \frac{4.50}{3}=$1.50

Cost of 5 pounds of apple = 5 x $1.50 =$7.50

Cost of 12 pounds of apple = 12 x $1.50 =$18.00

6 0
3 years ago
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