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3 years ago

Helping my sister with combining like terms & I just need some refreshing here is my question:

Mathematics

2 answers:

Mashutka [201]3 years ago

7 0

Answer,

= -4n - 3

Explanation,

Combine Like Terms:

= n + 4 + −9 + −5n

= (n + −5n) + (4 + −9)

= −4n + −5

Hope This Helps :-)

denpristay [2]3 years ago

3 0

Answer:

-5-4n

Step-by-step explanation:

add 4 + -9 = -5

add n + -5n= -4n

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The length of a rectangle is 4 feet more than 4 times the width. If the area is 48 square feet, find the width and length.

____ [38]

Answer:

L = 16 W=3

Step-by-step explanation:

Let width = x

Length = 4x +4

Area = 48

Area = L times w

48= (4x+4)(x)

48 = 4x^2 +4x

0 = 4x^2 +4x -48

0= 4(x^2 +x-12)

0 = (x+4)(x-3)

x = -4

x=3

Ignore the -4 because it's unrealistic to have negative length width or area

Hence, only solution is 3

Width = 3

Length = 4x + 4 = 4(3) + 4 = 12+4 = 16

Hope this helps!

Please mark brainliest if you think I helped! Would really appreciate!

5 0

3 years ago

If y = 5.25 when x = 14, find the value of k

Kay [80]

Your question is quite incomplete: who's k?

Anyway, I'm assuming that this is one of those question about variation. If x and y are in proportion, we have

$y=kx \implies k=\dfrac{y}{x}=\dfrac{5.25}{14}=0.375$

If x and y are in inverse proportion, we have

$y=\dfrac{k}{x} \implies k=xy=5.25\cdot 14=73.5$

8 0

3 years ago

Annie estimates that the height of a bookcase is 78. 25 in. The actual height is 75. 50 in. To the nearest tenth of a percent, w

pav-90 [236]

The error percentage is 4.13%.

<h2>Error percentage</h2>

The amount of mistakes is expressed as if it is a part of the total which is a hundred. The ratio can be expressed as a fraction of 100. The word percent means per 100. It is represented by the symbol ‘%’.

Given

Annie estimates that the height of a bookcase is 78.25 in.

The actual height is 75.50 in.

The error percentage.

<h3>How to find the error percentage?</h3>

We know the formula for the error percentage.

$\rm \% Error = \dfrac{Measured \ value- Actual\ value}{Actual\ value} * 100\\\\ \% Error = \dfrac{78.25 - 75.50}{78.75}*100\\\\ \% Error = \dfrac{3.25}{78.75}*100\\\\ \% Error = 0.0413*100\\\\ \% Error = 4.13 \%$

The error percentage is 4.13%.

More about the error link is given below.

brainly.com/question/13286220

8 0

2 years ago

Two friends practice taekwondo in the same class. The age of the older friend is three times that of the younger. The sum of the

vampirchik [111]

Answer:

4 and 12

Step-by-step explanation:

a = young

b = old

b = 3a, a+b =2a+8 => a = 4, b = 12

6 0

3 years ago

Can someone help me with this one? Thank you.

Andreas93 [3]

Step-by-step explanation:

I haven't used distance formula or Pythagoras theorem, not sure why that's given at the bottom of your question. check the image. that is how I solved it

4 0

3 years ago