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yanalaym [24]
3 years ago
7

Help Me Please Brainliest 20 points and thanks/5 stars

Mathematics
1 answer:
olga2289 [7]3 years ago
7 0

Answer:

#2 (3rd answer) ask 3 people at each every table in the cafeteria and (5th answer) every 10th person leaving the school at the end of the day

#3 [selection 1] true; [selection 2] false; [selection 3] true

#4 brown toy blocks "likely"; yellow toy blocks "unlikely"; red toy blocks "unlikely"

#5 mean "decreases", median "no change", range "increases"

#7 The number of Pedro's email has less variance than Annika's

Step-by-step explanation:

#2  <u>Amy shouldn't ask:</u>

  • 50 students in the computer club because they would all like to do online testing
  • 35 students in her honors math class because it doesn't cover the votes for the whole school
  • her 10 closest friends because they will choose what she likes.

#4 There are more brown toy blocks so you will be more likely to pick one up, for the yellow and red blocks you are more unlikely to pick one up because of the small amount they both have

#5 Put the quiz grades for least to greatest

15,17,17,19,20 find the mean, median, and range

mean = 17.6  median = 17  range = 5

Now add the next quiz score (3)

3,15,17,17,19,20 find the mean, median, and range

mean = 15.2  median = 17  range = 17

Now compare the two

mean went down, median stays the same, and range went up.

#7 The number of Pedro's email has less variance than Annika's because Annika's number of emails are more spread than Pedro's.

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A right triangle has an area of 33cm and a height of 11cm.
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The base of the right triangle is 6 cm long.
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b = (A/b) * 2
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3 years ago
The rate of change of the downward velocity of a falling object is the acceleration of gravity (10 meters/sec 2) minus the accel
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Answer:

See below

Step-by-step explanation:

Write the initial value problem and the solution for the downward velocity for an object that is dropped (not thrown) from a great height.

if v(t) is the speed at time t after being dropped, v'(t) is the acceleration at time t, so the the initial value problem for the downward velocity is

v'(t) = 10 - 0.1v(t)

v(0) = 0 (since the object is dropped)

<em> The equation v'(t)+0.1v(t)=10 is an ordinary first order differential equation with an integrating factor </em>

\bf e^{\int {0.1dt}}=e^{0.1t}

so its general solution is  

\bf v(t)=Ce^{-0.1t}+100

To find C, we use the initial value v(0)=0, so C=-100

and the solution of the initial value problem is

\bf \boxed{v(t)=-100e^{-0.1t}+100}

what is the terminal velocity?

The terminal velocity is

\bf \lim_{t \to\infty}(-100e^{-0.1t}+100)=100\;mt/sec

How long before the object reaches 90% of terminal velocity?

90%  of terminal velocity = 90 m/sec

we look for a t such that

\bf -100e^{-0.1t}+100=90\rightarrow -100e^{-0.1t}=-10\rightarrow e^{-0.1t}=0.1\\-0.1t=ln(0.1)\rightarrow t=\frac{ln(0.1)}{-0.1}=23.026\;sec

How far has it fallen by that time?

The distance traveled after t seconds is given by

\bf \int_{0}^{t}v(t)dt

So, the distance traveled after 23.026 seconds is

\bf \int_{0}^{23.026}(-100e^{-0.1t}+100)dt=-100\int_{0}^{23.026}e^{-0.1t}dt+100\int_{0}^{23.026}dt=\\-100(-e^{-0.1*23.026}/0.1+1/0.1)+100*23.026=1,402.6\;mt

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3 years ago
Blake has 864 square inches of material with which to create a hollow three-dimensional container. He decides to make either a c
leonid [27]

Answer:

I think it's a cube, because the cube has bigger spaces because of the edges, but I don't know how much...

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Figure A is a scale image of Figure B.
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<em>Greetings from Brasil...</em>

According to the statement, one figure is scaled in relation to another, so we can apply similarity to polygons.....

So

BIG/small = BIG/small

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small/BIG = small/BIG

27/X = 45/35

OR

35/45 = X/27

27/X = 45/35

45X = 27·35

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X = 945/45

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Which algebraic expression represents “the product of a number and five”?
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Answer: n-5

Step-by-step explanation:

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