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Elodia [21]
3 years ago
5

What is the correct answer and why show your work

Mathematics
2 answers:
Anna11 [10]3 years ago
6 0

Answer:

A7.45x = y

Step-by-step explanation:


We can use a ratio to solve this problem.  Take the total cost of the lunches and divide by the number of lunches.

y = total cost of lunches and

x = number of lunches

74.50             y

-------------- = ------------

10                     x


Using cross products

74.5 x = 10 y

Divide each side by 10

74.5/10 x= 10y/10

7.45x = y


GaryK [48]3 years ago
3 0

Answer:


Step-by-step explanation:

Discussion

There is only one answer that works and that is A. The rest give you strange answers. Each box, no matter how many there are, costs 7.45

Since you don't know the number of boxes, call that x

The total cost is y

Therefore y = 7.45*x

The other choices

B: When you cross multiply the proportion of B, you get

7.45*y = 10x That means the total (y) is multiplied by 7.45 (making y not the total). When you divide by 10, the answer is now meaningless. B is incorrect.

C: C is saying that each box costs 74.50. That was supposed to be the total for 10 boxes. C is getting to be far too big. C is not the answer.

D: They total is y, not 74.5 * y. The answer is getting out of control (too big) if it is D. So D is incorrect.

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A taxi travels 25 kilometers east of an airport. Then it travels from that point to a point that is 40 kilometers west of the ai
kati45 [8]
25km east + 25km return+  40km west + 40km return = 130km

Hope that helped :)
7 0
3 years ago
-12x - 12y = 4 3x + 3y = 0
Svetradugi [14.3K]

Answer:

no Solution

Step-by-step explanation:

-12x-12y=4\\ 3x+3y=0

12x-12y=4

add 12y to both sides

12x-12y+12y=4+12y

divid both sides by -12

\frac{-12x}{-12}=\frac{4}{-12}+\frac{12y}{-12}

simplfy

x=-\frac{1+3y}{3}

\mathrm{Substitute\:}x=-\frac{1+3y}{3}

\begin{bmatrix}3\left(-\frac{1+3y}{3}\right)+3y=0\end{bmatrix}

\begin{bmatrix}-1=0\end{bmatrix}

7 0
3 years ago
The monthly charge for a waste collection service is 1830 dollars for 100 kg of waste and 2460 dollars for 135 kg of waste. (a)
Ulleksa [173]

Answer:

C=18w+30

Step-by-step explanation:

We are given that The monthly charge for a waste collection service is 1830 dollars for 100 kg of waste

So, (x_1,y_1)=(100,1830)

We are also given that The monthly charge for a waste collection service is 2460 dollars for 135 kg of waste.

So, (x_2,y_2)=(135,2460)

We are supposed to find a linear model for the cost, C, of waste collection as a function of the number of kilograms, w.

So, we will use two point slope form :

Formula : y-y_1=\frac{y_2-y_1}{x_2-x_1}(x-x_1)

Substitute the values

y-1830=\frac{2460-1830}{135-100}(x-100)

y-1830=18(x-100)

y-1830=18x-1800

y=18x-1800+1830

y=18x+30

y denotes the cost

x denotes the weight

So, Replace y with C and x with w

C=18w+30

So, a linear model for the cost, C, of waste collection as a function of the number of kilograms, w is C=18w+30

7 0
3 years ago
Which is more, 5 tons or 9,998 pounds?
Katyanochek1 [597]

Answer:

5 tons

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
If maya and her friends share the money equally, how much will each person get? Explain how you found your answer.
earnstyle [38]
20 cents because 80 cents / 4 ppl is 20
8 0
3 years ago
Read 2 more answers
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