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Mamont248 [21]
3 years ago
6

Robert threw a rock off a bridge into the river. The distance from the rock to the river is modeled by the equation h=-16ť – 16t

+ 60, where h is the height in feet and t is the time in seconds. Find how long it took the rock to enter the water.​
Mathematics
1 answer:
cluponka [151]3 years ago
8 0

Answer:

1.5 seconds

Step-by-step explanation:

h=-16t² – 16t+ 60

When the rock enter the water, the height is 0. ... h=0

0 = -16t² – 16t+ 60 = -4 * (4t² - 4t +15) = -4* (2t - 3) (2t +5)

2t-3=0   or 2t+5 = 0

t = 3/2  or t = -5/2   (time can't be negative)

t = 3/2   or 1.5

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Answer:

true

Step-by-step explanation:

because the variable terms are in the left side of the equation and everything else in right side.

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3 years ago
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vekshin1

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Step-by-step explanation:

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8 0
3 years ago
Juliette spends $6.12 at the store Morgan spends 3 times as much as Juliette Jonah spends $4.29 more than Morgan how much money
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3 years ago
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8 0
3 years ago
During a certain week, the mean price of gasoline in the New England region was $3.796 per gallon. A random sample of 32 gas sta
Ymorist [56]

Answer: the probability that the mean price for the sample was between $3.781 and $3.811 that week is 0.94122

Step-by-step explanation:

Given that;

sample size n = 32

mean μ = $3.796

standard deviation σ = 0.045

P(3.781 < x" < 3.811) = ?

Standard Error S.E = σ/√n = 0.045/√32 = 0.007955

z value for 3.781, z = x-μ/S.E = (3.781-3.796)/0.007955 = -1.8856 ≈ -1.89

z value for 3.811, z = x-μ/S.E = (3.811-3.796)/0.007955 = 1.8856 ≈ 1.89

P(3.781 < x" < 3.811) = P( -1.89 < z < 1.89)

= P(z < 1.89) - P(z <  -1.89)    

from z-score table  

⇒ 0.9706 - 0.02938

⇒ 0.94122

Therefore the probability that the mean price for the sample was between $3.781 and $3.811 that week is 0.94122

6 0
3 years ago
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