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Aneli [31]
3 years ago
15

The stopping distance d of an automobile is directly proportional to the square of its speed s.

Mathematics
1 answer:
IRINA_888 [86]3 years ago
3 0

Answer:

192 feet is the stopping distance at 48 mph.

Step-by-step explanation:

Set up the proportion     \frac{x}{75} =\frac{48^{2} }{30^{2} }    

x/75 = 2304/900   cross multiply  to get 900x = 172800

172800 ÷ 900 = 192

x = 192

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Answer:

Hulian's age is 7.

Thomas's age is 22.

Step-by-step explanation:

Let Hulian = h

Let Thomas = t

Set the system of equation:

h = t - 15

h + t = 29

Plug in t - 15 for h in the second equation:

(t - 15) + t = 29

Simplify. Combine like terms:

2t - 15 = 29

Isolate the variable, t. Note the equal sign, what you do to one side, you do to the other. Do the opposite of PEMDAS. First, add 15 to both sides:

2t - 15 (+15) = 29 (+15)

2t = 44

Divide 2 from both sides:

(2t)/2 = (44)2

t = 44/2

t = 22

Plug in 22 for t in one of the equations:

h = t - 15

h = 22 - 15

h = 7

Hulian's age is 7.

Thomas's age is 22.

~

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3 years ago
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7 0
2 years ago
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