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Marina CMI [18]
3 years ago
9

The cost of a toy is $20 less than 2 times the cost of a toy train. If the cost of the toy car is $100, what is the cost of the

toy train?
Mathematics
2 answers:
Nutka1998 [239]3 years ago
8 0
---------------------------------------------------------------------
Define x :
---------------------------------------------------------------------
Let the cost of the toy train be x.
Toy Train = x
Toy car = 2x - 20

---------------------------------------------------------------------
Construct equation :
---------------------------------------------------------------------
The toy car costs $100.
⇒ 2x - 20 = 100

---------------------------------------------------------------------
Solve x :
---------------------------------------------------------------------
2x - 20 = 100
2x = 100 + 20
2x = 120
x = 60 

---------------------------------------------------------------------
Find the cost of the toy train :
---------------------------------------------------------------------
Cost of the toy train = x = $60

---------------------------------------------------------------------
Answer: The toy train costs $60.
---------------------------------------------------------------------
kiruha [24]3 years ago
5 0
The toy is 2(x)-20, x is 100, being the toy car. So 2(100)= 200 -20 =180. The cost of the toy is $180
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3 years ago
Explain how to write 3x3/8 as a product of a whole number and a unit fraction
Sonja [21]
Hi there!

To write 3 x 3/8 as a unit fraction it is 9/8.

To write 3 x 3/8 as a whole number it is 1 1/8.

Explanation:

When you multiply 3 x 3/8 you get 9/8.

But when you make it to a proper fraction you get 1 1/8.

Hope this helps ;)
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3 years ago
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melamori03 [73]

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3 years ago
Read 2 more answers
A study was done that looked at how much red meat people consumed and how long they lived. The correlation r was found to be 0.9
AVprozaik [17]

Answer:

False

Step-by-step explanation:

Since the correlation r was found to be 0.98 (a value closer to 1).  

Let X =how much red meat people consumed

let Y = how long they lived.

where the x-values are the values of the deviations of co-ordinates X from Xₙ, their mean value and the y-values are the values of the deviations of co-ordinates Y from Yₙ, their mean value.

That is, x=(X−Xₙ) and y=(Y−Yₙ).

The results of this determination give values of r lying between +1 and −1, where;

+1 indicates perfect direct  correlation,

−1 indicates perfect inverse correlation and

0 indicates that no correlation exists.

Between these values, the smaller the value of r, the less is the amount of correlation which exists.

Generally, values of r in the ranges 0.7 to 1 and −0.7 to −1 show that a fair amount of correlation exists.

therefore, it can be seen that there is a perfect relationship between the quantity eaten and how long the person live

But, the correlation does not consider those that does not consume meat, and it is very hard to determined the answer to the question.

the answer is false because there are other reasons that determined longevity of life apart from meat consumption.

3 0
3 years ago
A $50 item was marked up 20%. What is the total increased cost of the item?​
GenaCL600 [577]

They increased it by $10.

It ended up costing $60.

Hope this helps.

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3 years ago
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