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Levart [38]
3 years ago
7

Is this wrong If so please explain why or why not

Mathematics
1 answer:
vovangra [49]3 years ago
3 0

Answer:

2: The perimeter of the base is 37 units.

Step-by-step explanation:

1. A = LW = 21 * 16 = 336 units^2     True

2. P = 2(L + W) = 2(21 + 16) = 2(37) = 74 units      False

3. H = 21 units     True

4. SA = 2LW + 2H(L + W) = 2(21)(16) + 2(21)(21 + 16) = 2226 units^2     True

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Find the error with this proof and explain how it mat be corrected in order to clearly prove the equation.
enyata [817]

Answer:

Step-by-step explanation:

It is true that for any given odd integer, square of that integer will also be odd.

i.e if m is and odd integer then m^{2} is also odd.

In the given proof the expansion for (2k + 1)^{2} is incorrect.

By definition we know,

(a+b)^{2} = a^{2} + b^{2} + 2ab

∴ (2k + 1)^{2} = (2k)^{2} + 1^{2} + 2(2k)(1)\\(2k + 1)^{2} = 4k^{2} + 1 + 4k

Now, we know 4k^{2} and 4k will be even values

∴4k^{2} + 1 + 4k will be odd

hence (2k + 1)^{2} will be odd, which means m^{2} will be odd.

7 0
3 years ago
Which whole number is equal to the fraction 42/6
DaniilM [7]

Answer:

7.

Step-by-step explanation:

Think of 42/6 as a division question.

42 ÷ 6.

The answer to this equation is 7.

8 0
2 years ago
If + × += + and + × - = - ThenWhy - × - = + ?​
DiKsa [7]

Answer:

Here is a way one of my math teachers taught me.

For + x + = +:

In elementary school, you were taught by your math teacher that an positive number multiplied with a positive number is equal to a positive number. To solve, use basic rules of multiplications.

For + x - = -:

Think of it this way. There are two line segments that makes a positive sign. When multiplying, you are subtracting a line, which would result in a negative sign. Whenever a positive multiplies a negative, it is always a negative outcome.

For - x - = +:

There are two lines given (two negatives). When multiplied, the two lines make a positive sign (which is made by drawing two lines). This shows that two negative numbers multiplied or divided together will make a positive sign .

~

8 0
3 years ago
Consider this set of numbers: 1, 1, 2, 2, 3, 3, 4, 7, 7, 7, 8, 9. the _____ of the set is 7.
erastova [34]

Answer:

mode

Step-by-step explanation:

The mode of the set is 7, as 7 is the number that occurs the most frequently.

6 0
1 year ago
Help geometry question
Sauron [17]

Answer:

x=10

Step-by-step explanation:

43 and (4x+3) are vertical angles, which mean they are equal

so, 43=(4x+3)

  43-3=(4x+3-3)

     40=(4x)

  40/4=4x/4

      10=x

6 0
3 years ago
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