The answer is B. (15,18)
Solution:
First, let's set the variables first.
X = dollars per hour to clean the floor
Y = dollars per hour to clean the rest of the house
For the first statement, "<span>2 hours to clean floors and 3 hours to clean the rest of a house, the total charge is $84"
We can put it into an equation.
2X + 3Y = 84 </span>⇒ equation 1
For the first statement, "<span>1 hour to clean floors and 4 hours to clean the rest of a house, the total charge is $87'
X + 4Y = 87 </span>⇒ equation 2
Multiply first equation 2 by 2 to make the coefficient of both equations 1 and 2 the same.
Using elimination method in solving for x and y,
(equation 1) 2X + 3Y = 84
(equation 2) 2(X + 4Y) = 87
2X + 8Y = 174 ⇒ equation 3
Next, subtract equation 3 from equation 1.
2X + 3Y = 84
- (2X + 8Y = 174)
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- 5Y = -90
Y = 18
Find X when Y = 18
@ equation 1 : 2X + 3Y = 84
2X + 3(18) = 84
2X + 54 = 84
2X = 84 - 54
2X = 30
X = 15
The answer is in ordered pairs of cleaning the floors and to clean the rest of the house. So, in the form (X,Y).
Answer: (15,18)
Answer:
$96
Step-by-step explanation:
$128 X 78/100
= $128 X .75
= $96
Dion would buy it, he's rich
Answer: See explanation
Step-by-step explanation:
The difference in the length of the polar bear will be:
= 2 7/9 - 1 5/6
The lowest common multiple of 9 and 6 is 18.
= 2 7/9 - 1 5/6
= 2 14/18 - 1 15/18
= 17/18
She is incorrect as she subtracted the denominator from the numerators and didn't find their lowest common multiple. She got the answer this way:
= 2 7/9 - 1 5/6
= (2 - 1) (7-5)/(9-6)
= 1 2/3
Answer:
私は屋根裏部屋に50人の子供がいますが、母は知らないので、入り口の下に机を置いていたので、子供たちは水が不足していて、おそらく死んでいると思います。
Step-by-step explanation:
Step-by-step explanation:
60 = 25x - 2 - 3
The 60 is the total amount she got from doing the job.
3 + 2 = 5, and $5 is subtracted from her buying salt and replacing a shovel.
Randi charges $25 per x hours.
x = amount of hours she takes.
The equation simplified would be:
60 = 25x - 2 - 3
60 = 25x (- 2 - 3)
60 = 25x - 5
Each term is measured in $, for we are dealing with economics, for we see that Randi is trying to buy equipment to help her earn money, which deals with the flow of cash.
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*As it does not tell you that you have to solve, you can leave your answer as such.
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