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nalin [4]
3 years ago
13

Rachel is a stunt driver, and she's escaping from a building that is about to explode! DDD represents Rachel's remaining distanc

e (in meters) as a function of time ttt (in seconds). D=-38t+220D=−38t+220D, equals, minus, 38, t, plus, 220 What is Rachel's speed?
Mathematics
1 answer:
skelet666 [1.2K]3 years ago
4 0

Answer:

38 m/s

Step-by-step explanation:

We are given that

D represent Rachel's remaining distance( in meters ) as  a function of time is given by

D=-38t+220

We have to find the Rachel's speed.

We know that

Velocity=\frac{ds}{dt}

Substitute the values then we get

v=\frac{d(-38t+220)}{dt}=-38 m/s

Speed =\mid v\mid

Speed =\mid -38\mid =38m/s

Hence, the Rachel's speed is given by =38 m/s

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Answer:144 meter per second

Step-by-step explanation:

Frequency =24 hertz

Wavelength =6 meters

Speed =frequency x wavelength

Speed =24 x 6

Speed =144 meter per second

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How many 45 degree angles does it take to make a full turn?
VLD [36.1K]
Full turn: 360 degrees
360/45=8
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Solve the system of equations by substitution.<br> 4x−3y=18 <br> x+2y=−1
Oksana_A [137]

Answer:

Step-by-step explanation:

4x - 3y = 18

-4x - 8y = 4

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(3, -2)

3 0
3 years ago
Assume that the readings at freezing on a bundle of thermometers are normally distributed with a mean of 0°C and a standard devi
kolezko [41]

Answer:

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Step-by-step explanation:

We solve the above question using z score formula

z = (x-μ)/σ, where

x is the raw score = -0.084 °C

μ is the population mean = 0 °C

σ is the population standard deviation = 1°C

Z score =x - μ/σ

= -0.084 - 0/1

= -0.084

Probability value from Z-Table:

P(x<-0.084) = 0.46653

P(x>-0.084) = 1 - P(x<-0.084) = 0.53347

The probability of obtaining a reading greater than -0.084°C = P(x > -0.084) =

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