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DerKrebs [107]
3 years ago
7

This is hard... who knows it?

Mathematics
2 answers:
Komok [63]3 years ago
6 0

Answer:

-9,18 is the only sensible answer

Step-by-step explanation:


OLga [1]3 years ago
4 0

It will be (-9,18). hope this helps

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PLEASE HELP {It costs 5,700 every one sixth of an hour to build a hotel how many cents does building a hotel cost per second?}
Keith_Richards [23]
One sixth of an hour is 10 minutes.
That means it costs 5,700 every 10 minutes.

Costs 5,700 = 10 minutes

Dive 10 on both sides.

Costs 570 = 1 minute

Lets convert the minute into seconds.

Costs 570 = 60 seconds

Divide both sides by 60.

Costs 9.5 cents = 1 second

Round it off since you can't pay 9.5 cents.

Costs 10 cents = 1 second

This means that every second they pay 10 cents for the hotel. :D


8 0
4 years ago
one half the cost of a dress decreased by $12 is the same as 2/5 the cost of a dress. What is the cost of the dress?
guajiro [1.7K]

Answer:

$120

Step-by-step explanation:

Let the cost of the dress be "c"

ONE HALF the cost DECREASED by 12, can be written as:

\frac{1}{2}c-12

2/5th the cost of dress, can be written as:

\frac{2}{5}c

Now, we equate both parts and solve for c to get cost of dress. Shown below:

\frac{1}{2}c-12=\frac{2}{5}c\\\frac{1}{2}c-\frac{2}{5}c=12\\\frac{5-4}{10}c=12\\\frac{1}{10}c=12\\c=\frac{12}{\frac{1}{10}}\\c=12*10\\c=120

Thus,

The ccost of the dress is $120

6 0
3 years ago
I need help on nine and 10 instructions say to solve these equations by cross multiplying
Aneli [31]

Answer:

  9.  a = -1

  10.  b = 20

Step-by-step explanation:

The term "cross multiplying" is used to describe the appearance of the result of multiplying both sides of the equation by the product of the denominators. The result is the left numerator is multiplied by the right denominator, and the right numerator is multiplied by the left denominator. The property of equality that supports this is the multiplication property of equality, which tells you the values of the variables are unchanged if you multiply both sides by the same thing. That multiplier is chosen so that it cancels the denominators.

__

<h3>9.</h3>

  \dfrac{2a-5}{3a-4}=\dfrac{2a-3}{3a-2}\\\\(3a-2)(2a-5)=(3a-4)(2a-3)\qquad\text{"cross multiply"}\\\\6a^2 -19a +10=6a^2-17a+12\qquad\text{expand}\\\\-2=2a\qquad\text{add $19a-6a^2-12$}\\\\\boxed{a=-1}\qquad\text{divide by 2}

__

<h3>10.</h3>

  \dfrac{b-2}{b-6}=\dfrac{b+2}{b-4}\\\\(b-4)(b-2)=(b-6)(b+2)\qquad\text{"cross multiply"}\\\\b^2-6b+8=b^2-4b-12\qquad\text{expand}\\\\20=2b\qquad\text{add $6b+12-b^2$}\\\\\boxed{b=20}\qquad\text{divide by 2}

_____

<em>Additional comments</em>

Here are the answer checks:

  9. (2(-1) -5)/(3(-1)-4) = (2(-1)-3)/(3(-1)-2) ⇒ -7/-7 = -5/-5 . . . yes

  10. (10 -2)/(10 -6) = (10 +2)/(10 -4) ⇒ 8/4 = 12/6 . . . yes

__

Sometimes this method of solving the problem will result in extraneous solutions. Those will generally be values of the variable that make one or more of the denominators be zero. You must be careful to exclude those values from any possible solution set.

5 0
3 years ago
Https://files-cdn.schoology.com/eff1043385e13ac014eaf6e69f84525b?content-type=app
Anarel [89]

Answer:

srry i need points

Step-by-step explanation:

8 0
3 years ago
(PLZ HELP ME)
Mumz [18]

Answer:

d 32 ft

Step-by-step explanation:

multiply 8 and 4


5 0
4 years ago
Read 2 more answers
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