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3 years ago

Need help 8th grade math

Mathematics

1 answer:

Yanka [14]3 years ago

6 0

The answer is the 3rd one

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Perform the indicated operation.(4r/r+3) - (5/r)

Aleks [24]

Answer:

4r² - 5r - 15 / r(r+3)

Step-by-step explanation:

To solve this problem, we will proceed the following way, writing down the common multiple of the denominators.

$\frac{4r}{r+3} -\frac{5}{r} =\frac{4r(r)-5(r+3)}{r(r+3)} =\frac{4r^{2}-5r-15 }{r(r+3)}$

Thus, the answer is 4r² - 5r - 15 / r(r+3)

7 0

3 years ago

What does this mean -(-c) when c+2/3 on the numberline

ad-work [718]

Answer:

Step-by-step explanation:

a negative minus a negative is a positive so it mean c plus 2divided by 3 on the the number line

5 0

3 years ago

Convertir a fraccion 0.0308641975308642‬

jekas [21]

Type it in on the calculator

8 0

3 years ago

Andre owned a 1/4 acre lot. He wanted to construct a 120’ x 80’ tennis court on the lot. How many square feet will remain uncove

OLga [1]

The area of the tennis court is computed by multiplying the dimensions given,

A = 120' x 80'

A = 9600 ift

Then, we convert the area in ft² to acres,

A = (9600 in²)(2.3 x 10^-5/ 1 in²)

A = 0.24 acre

The portion of land remaining is,

A of remaining = 0.25 acre - 0.24 acre

= 0.1 acre

The remaining portion is for Andre's studies.

This, 0.1 ft² is equal to the 4% of the given area of the court.

3 0

3 years ago

In a test (+4) marks are given for every correct answers and (-3) marks are given for every incorrect answers 1) Tahiya answered

stealth61 [152]

Answer:

Tahiya attempted 3 incorrect answers.

Helmin attempted 11 incorrect answers.

Step-by-step explanation:

Correct = +4

Incorrect = -3

1) Tahiya got 12 correct answers and scored a 40, the number of incorrect answers was:

$4*12-3I=40\\I=\frac{8}{3}\\I=2.67$

2) Helmin got 5 correct answers and scored a -14, the number of incorrect answers was:

$4*5-3I=-14\\I=\frac{34}{3}\\I=11.33$

In both cases the number of incorrect answers obtained is a fraction, which means that either the data provided is inaccurate, or that the scores obtained by the students are approximate. Let's round the number of incorrect answers to the nearest whole answer.

Tahiya attempted 3 incorrect answers.

Helmin attempted 11 incorrect answers.

4 0

3 years ago