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olya-2409 [2.1K]
3 years ago
13

Add up the answer first to see of these correct or incorrect, if incorrect explain why it is not equal.

Mathematics
1 answer:
Stells [14]3 years ago
8 0

Answer:

1) incorrect

2) incorrect

Step-by-step explanation:

-2x-2x = 0 ?

-2x -2x = -4x

It will be 0 only if x = 0.

Not always true, so incorrect

x+x = x² ?

2x = x²

They will be equal if x = 0 or 2.

Not always true so incorrect

You might be interested in
The marksobtained by a group of students in science test are 90, 49, 87, 74,80, 85, 49
Iteru [2.4K]

Answer:

1. Median refers to the central value of a collection of data

Therefore it is 73.4

2. Mode refers to the frequency of a value in a collection of data

It will be 49 as it is repeated 2 times

3. Range refers to The greatest number subtracted from the smallest number

Which will be 90-49=41

Hope this helps dude!

Please mark me as brainliest

7 0
2 years ago
Simplify 2(x - 4) + 7(x + 2).<br><br> Step by step please
nasty-shy [4]

2(x - 4) + 7(x + 2)

mutiply the first bracket by 2

(2)(x)=2x

(2)(-4)= -8

mutiply the second bracket by 7

(7)(x)=7x

(7)(2)= 14x

2x-8+7x+14

2x+7x-8+14 ( combine like terms)

Answer:

9x+6 or 6+9x

7 0
3 years ago
Read 2 more answers
Write the quadratic function in standard form
Murrr4er [49]

Answer:

B. f(x) = x² + 10x + 17

Step-by-step explanation:

Given:

f(x) = (x + 5)² - 8

Required:

Write in standard form

SOLUTION:

f(x) = (x + 5)² - 8

Expand (x + 5)²

f(x) = (x + 5)(x + 5) - 8

f(x) = x(x + 5) +5(x + 5) - 8

f(x) = x² + 5x + 5x + 25 - 8

Add like terms

f(x) = x² + 10x + 17

6 0
3 years ago
Abby used the law of cosines for TriangleKMN to solve for k.
torisob [31]

Answer:

  m∠K = 37° and n = 31

Step-by-step explanation:

A lot of math is about matching patterns. Here, the two patterns we want to match are different versions of the same Law of Cosines relation:

  • a² = b² +c² -2bc·cos(A)
  • k² = 31² +53² -2·31·53·cos(37°)

<h3>Comparison</h3>

Comparing the two equations, we note these correspondences:

  • a = k
  • b = 31
  • c = 53
  • A = 37°

Comparing these values to the given information, we see that ...

  • KN = c = 53 . . . . . . . . . . matching values 53
  • NM = a = k . . . . . . . . . . . matching values k
  • KM = b = n = 31 . . . . . . . matching values 31
  • ∠K = ∠A = 37° . . . . . . . matching side/angle names

Abby apparently knew that ∠K = 37° and n = 31.

__

<em>Additional comment</em>

Side and angle naming for the Law of Sines and the Law of Cosines are as follows. The vertices of the triangle are labeled with single upper-case letters. The side opposite is labeled with the same lower-case letter, or with the two vertices at either end.

Vertex and angle K are opposite side k, also called side NM in this triangle.

5 0
1 year ago
9=ln(x+7) | Solve for x
frez [133]
Remember that ln=log_{e}
and

log_{a}x=y means a^y=x
convert
ln(x+7)=9 means
e^(9)=x+7
minus 7 from both sides
e^9-7=x
use calculator to evaluate
8096.08=x aprox
8 0
2 years ago
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