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olga2289 [7]
3 years ago
9

A train traveling 90mph takes 4 seconds to completely enter a tunnel and 40 additional seconds to pass through the tunnel.

Mathematics
1 answer:
Sunny_sXe [5.5K]3 years ago
4 0
90miles/hour
divide by 360 to convert to miles per second
multiply by 5280 to get to feet per second
multiply by number of seconds to get length (in feet) of each object
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Crank
=7(∛2x) - 6(∛2x) - 6(<span>∛x)
= </span>∛2x - 6<span>∛x

answer
C. </span>∛2x - 6∛x
third choice
6 0
3 years ago
Help please really needed
Anarel [89]

Answer:

Either :

1/2 10x+1/2 20y+1/2 10z

or

5x+10y+5z

Step-by-step explanation:

You're just multiplying everything by 1/2

7 0
2 years ago
The radius of a circle is (7x+3)cm. Write an expression to represent the area of the circle in simplified form
zepelin [54]

Answer:

A = π(7x + 3)² cm²

Step-by-step explanation:

A = πr² is the appropriate equation.  If r = 7x + 3 cm, then the area of this particular circle is:

A = π(7x + 3)² cm²

3 0
3 years ago
How can you change the equation y = 2x + 3 to function notation?
qwelly [4]

Answer:

f(x)=2x+3

Step-by-step explanation:

The first thing that would need to be done is solving for y. This problem has already done this. The next step is to exchange y for f(x)

That is all. This would mean that the function notation for the equation would be: f(x)=2x+3

8 0
3 years ago
Suppose you draw a card from a well-shuffled deck of 52 cards. Find each of the following odds.
garik1379 [7]
1)  number of cards that aren't : number of cards that are 3
we have 48 cards that arent 3 and 4 cards that are. that means that odds are:
12:1 of not drawing 3

2) fallow same logic. its just opposite.
1:12

3) same logic. but there are only 2 black 7 cards which means that odds are:
50:2 or
25:1

4) opposite of previous.
1:25

6 0
3 years ago
Read 2 more answers
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