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Deffense [45]
3 years ago
14

Write a unit rate for the situation. Round to the nearest hundredth if necessary.

Mathematics
2 answers:
labwork [276]3 years ago
8 0

Answer:  The correct option is

(D) 0.85 miles/min.

Step-by-step explanation:  We are given to find the unit rate for the following situation :

"driving 140 miles in 2 hour 45 min."

We know that

1 hour = 60 minutes.

So, we get

2 hours 45 minutes = 2 × 60 + 45 = 120 + 45 = 165 minutes.

Now, we will use the UNITARY method.

In 165 minutes, distance drove = 140 miles.

Therefore, in 1 minutes, distance drove is given by

\dfrac{140}{165}=0.848484...=0.85~\textup{miles}.

Thus, the required unit rate is 0.85 miles/minute.

Option (D) is CORRECT.

Paraphin [41]3 years ago
4 0
2 hr and 45 minutes is = to 165min, so do 140 divided by 165, and you will get 0.8484miles per minute, which is D
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3 years ago
(3) Two people are at an elevator. At the same time one person starts to walk away from the elevator at a rate of 2 ft/sec and t
Gekata [30.6K]

Answer:

The rate at which the distance between the two people is changing 15 seconds later is 7.28 ft/sec.

Step-by-step explanation:

Here, we note the following

Let the person walking way fom the elevator be X

Let the other person going up in the elevator be Y

Therefore after 15 seconds, their positions will be;

For X,  2 ft/sec × 15 s = 30 ft away from the elevator

For Y,  7 ft/sec × 15 s = 105 ft up in the elevator

At that instant, the distance between them is given as

d² = x² + y²

= 30² +105² = 11925 ft²

d = √11925 ft²  = 109.202 ft

The rate of change of the distance between the two peopl, X and Y is given as

\frac{dd^2}{dt} = \frac{dx^2}{dt} + \frac{dy^2}{dt}

Therefore,  2d\frac{dd}{dt} = 2x\frac{dx}{dt} + 2y\frac{dy}{dt} or d\frac{dd}{dt} = x\frac{dx}{dt} + y\frac{dy}{dt}

Since \frac{dx}{dt} is given as 2 ft/sec and \frac{dy}{dt} = 7 ft/sec

Then  d\frac{dd}{dt} = 30 \times 2 + 105 \times 7 = 795\\

\frac{dd}{dt} = \frac{795}{109.202 } =7.28 ft/sec

8 0
3 years ago
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Writhe down 2 numbers from this list: -45,-21,-16,12,33,40 that have a difference of 29
ycow [4]

( - 16) - ( - 45) = 29
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3 years ago
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