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olga_2 [115]
3 years ago
13

The rails on a railroad are built from thirty foot sections. when a train wheel passed over the unction between two sections the

re is an audible click. inside a train that is traveling at 70 mph, how many clicks can a passenger hear during a 20 second interval?
Mathematics
1 answer:
maria [59]3 years ago
6 0

Answer:

70 clicks in 20 seconds

Step-by-step explanation:

The speed of the train in mile per hour is approximately the number of clicks heads in 20 seconds.

Each click shows that the train has travelled 30ft

1 click per second is =(30ft/sec = 3600 × 30) / 5280

20.45mph approximately 20mph

Therefore

20mph = 20 clicks in 20 s

30mph = 30 clicks in 20s

70mph= 70 clicks in 20s

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Camilias as backyard is in the shape of a rectangle and has a length of 16.5 feet. It costs her $976 to fence in the yard. If fe
Bumek [7]

Answer:

14 feet

Step-by-step explanation:

To calculate the width of the patio, we will use the formula of the perimeter, in the case of the rectangle it has the formula of:

p = 2 * l + 2 * w

Now we know that the total fencing value is $ 976 and that per foot is $ 16

that is, we can calculate the value of the perimeter, like this:

976/16 = 61

We know that the perimeter is 61 feet and that the length is 16.5, therefore it only remains to replace:

61 = 16.5 * 2 + 2 * w

solving for w:

w = (61 - 33) / 2

w = 14

which means that the width of the patio is 14 feet.

8 0
3 years ago
Dicriminant of x² – 49 = 0
Mama L [17]

Answer:

196

Step-by-step explanation:

The discriminant (Δ) is given by:

\Delta = b^2-4ac

Where the polynomial is in the form:

ax^2+bx+c=0

In this problem, a = 1, b = 0, and c = -49. Thus, plugging it into the formula:

\Delta = 0^2-4(1)(-49) = -(-196) = 196

Thus, the discriminant of x² – 49 = 0 is 196.

6 0
3 years ago
Determine which two triangles can be shown to be similar.
miv72 [106K]
The answer is B triangle RSZ and ZXY
3 0
4 years ago
Read 2 more answers
Ryan drove 480 miles and used 20 gallons of gas. How many miles did Ryan's car get per gallon? Write an equation that would solv
lisabon 2012 [21]

Answer:

24 miles per gallon

Step-by-step explanation:

Step one:

given data

total distance covered= 480miles

The total amount of gallons used is = 20

The miles per gallon

= 480/20

=24 miles per gallon

Step two:

hence the equation that we used in solving the problem is stated as

miles per gallon= total distance/total gallon sused

3 0
3 years ago
PLEASE HELP!!!!!!!! ITIS DUE IN 15 MINUTES.
Yuki888 [10]
Look at the picture.

8 0
3 years ago
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