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katen-ka-za [31]
3 years ago
15

Twenty times a square of a positive integer plus 50 equals negative 40 times the square of the positive integer plus one-hundred

and ten times the positive integer. Which equation could be used to solve for the unknown positive integer.
Mathematics
1 answer:
Dmitrij [34]3 years ago
3 0
Let "x" be the positive integer 
Twenty times a square of a positive integer plus 50:
20x² + 50
Negative 40 times the square of the positive integer plus one-hundred and ten times the positive integer:
-40x² + 100x

The equation could be used is shown below:
20x² + 50 = -40x² +100x
20x² + 40x² -100x + 50 = 0
60x² - 100x +50 =0

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Need help + explanation!! ^_^
Paha777 [63]
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9.75 = 1/80x

Then multiply each side by 80:

780 = x

The actual building's height is 780 ft.

We can check this answer by plugging in 780 for x in the original equation:

9.75 = 1/80(780)

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3 0
3 years ago
A farmer picked 600 portugals and oranges in total to be sold to the market. There are 3 times as many oranges as there are port
max2010maxim [7]

Answer:

450 portugals

Step-by-step explanation:

in this question, we are tasked with calculating the number of portugals which are picked by the farmer

Firstly, let the number of portugals picked be p and the number of oranges picked be r.

Thus;

p + r = 600 ••••••••••(i)

Secondly there are 3 times as many oranges as there are portugals;

That would be;

3 * r = p

3r = p. •••••••••(ii)

substitute ii into i

3r + r = 600

4r = 600

r = 600/4

r = 150

P = 3r

p = 3 * 150 = 450

6 0
2 years ago
Solve for d.<br> 4 + 20 = 8<br> d =
ivolga24 [154]

Answer:

D= 3

Explanation

4+20=24

24=8

24/8= 3

D=3

7 0
2 years ago
What is 3/4÷1/5? Plz show ur work...all help is appreciated
dangina [55]
3/4 ÷ 1/5
= 3/4 × 5/1
= 15/4

i am a mathematics teacher. if anything to ask please pm me
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