3 years ago

In an examination the following scores were a chief by a group of students:

Mathematics

1 answer:

e-lub [12.9K]3 years ago

7 0

A!

hope this helps you out

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A project is graded on a scale of 1 to 5. If the random variable, X, is the project grade, what is the mean of the probability

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Answer:

the mean is 3

answer choice D

Step-by-step explanation:

60/20

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A radioactive substance decays exponentially. A scientist begins with 190 milligrams of a radioactive

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Answer: 65.1 (mg)

Step-by-step explanation:

$y=190*e^{-a*t}\\\\Calculate\ a:\\\\t=33,y=95(mg)\\\\190*e^{-a*33}=95\\\\e^{-a*33}=0.5\\\\-a*33=ln(0.5)\\\\a=\dfrac{ln(\dfrac{1}{2}) }{-33} \\\\a=0,02100... \approx{0.021}\\\\If\ t=51\ h, y=190*e^{-0.02100*51}=65.09167...\approx{65.1}$

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2 years ago

A car travels 6 miles in 5 minutes. How fast is it going in miles per hour? How fast is it going in meters per second?

belka [17]

Answer:

72 m\ p.h.

Step-by-step explanation:

we have 60 minute in one hour

we must divide 60 by 5=12

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it is very easy

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How many different values can an algebraic expression like 5+(x+2)2 have?

AnnyKZ [126]

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3 years ago

Explain how to do this

Lera25 [3.4K]

Average of 2 numbers is 40
so total = 2 x 40 = 80

300 - 80 = 220

average of remaining 10 numbers = 220/10 = 22

answer
B) 22

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3 years ago