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valina [46]
3 years ago
11

9x+3y+12y-0.9x=9x+(-0.9x)+3y+12y The equation is Commutative Property.. How did they get that second equation?

Mathematics
1 answer:
kozerog [31]3 years ago
3 0
Oh how I miss the days when math was as simple as 2+2=4. 

Educated guess here: By putting parentheses. 
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Determine whether quantities vary directly or inversely and find the constant of variation. An employee earns $175 for 15 hours
Vitek1552 [10]

Answer:

210 dollars in 18 hours

Step-by-step explanation:

175 / 15 = 11.6666666667

11.6666666667 times 18 equals 210 dollars

6 0
3 years ago
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Freya wants to use her debit card to purchase a $135 tablet computer.
Ray Of Light [21]

Answer:

She must be sure there is at least $135 in her bank account for the purchase.

She must check to see if any automatic payments are scheduled for her account.

Step-by-step explanation:

just finished that assignment

8 0
3 years ago
Brainliest if you answer my question​
kkurt [141]

Answer:

1

Step-by-step explanation:

To find x, set both equations equal to each other.

\sqrt{x}  =   \sqrt{5x - 4}

( { \sqrt{x} })^{2}  =  ({ \sqrt{5x - 4} })^{2}

x = 5x - 4

x - 5x = 5x - 5x - 4

- 4x =  - 4

- 4x \div  - 4 =  - 4 \div  - 4

x = 1

5 0
2 years ago
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Prove that there is a positive integer that equals the sum of the positive integers not exceeding it. Is your proof constructive
Elena L [17]

Answer:

Constructive Proof

Step-by-step explanation:

Let x be a positive integer

x must be equal to sum of all positive integers exceeding it

i.e.

x = x + (x - 1) + ( x - 2) + ......... + 2 + 1

Equivalently,

x = ∑i (where i = 1 to x)

The property finite sum;

∑i (i = 1 to x) = x(x + 1)/2

So,

x = x(x + 1)/2 ------- Multiply both sides by 2

2 * x = 2 * x(x + 1)/2

2x = x(x + 1)

2x = x² + x ------- subtract 2x from both sides

2x - 2x = x² + x - 2x

0 = x² + x - 2x ----- Rearrange

x² + x - 2x = 0

x² - x = 0 ------ Factorise

x(x - 1) = 0

So,

x = 0 or x - 1 = 0

x = 0 or x = 1 + 0

x = 0 or x = 1

But x ≠ 0

So, x = 1

The statement is only true for x = 1

This makes sense because 1 is the only positive integer not exceeding 1

1 = 1

It is a Constructive Proof

A proof is constructive when we find an element for which the statement is true.

8 0
3 years ago
What is the percent of decrease from 500000 to 60000
DIA [1.3K]
Percent change = (new number - old number)/(old number) * 100

If the percent change is positive, it is a percent increase.
If the percent change is negative, it is a percent decrease.

In our case, the number goes from 500000 (the old number) to 60000 (the new number).

percent change = (new number - old number)/(old number) * 100

percent change = (60000 - 500000)/(500000) * 100

percent change = -88%

Answer: the percent decrease is 88%
5 0
3 years ago
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