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attashe74 [19]
2 years ago
11

a boy who is reading 20 pages of a book per day can finish it in one month. how many day will he take it if he reads 30 pages pe

r day
Mathematics
1 answer:
Natalka [10]2 years ago
8 0

Answer:

20

Step-by-step explanation:

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A researcher posts an online advertisement offering $25 in exchange for participation in a short study. The researcher accepts t
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Answer:

A

Step-by-step explanation:

The study only consisted of 10 people. 10 people are not enough to come to a concrete conclusion for a project. Hope this helps!!

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In the Central City Grand Prix, out of 30 cars that started the race, 12 of them finished. What percent of the cars finished the
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To get the answer we can use proportion.
30----------100%
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3 0
3 years ago
The position of an object along a vertical line is given by s(t) = −t3 + 3t2 + 7t + 4, where s is measured in feet and t is meas
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Answer:

The maximum velocity of the object in the time interval [0, 4] is 10 ft/s.

Step-by-step explanation:

Given : The position of an object along a vertical line is given by s(t) = -t^3+3t^2+7t +4, where s is measured in feet and t is measured in seconds.

To find : What is the maximum velocity of the object in the time interval [0, 4]?

Solution :

The velocity is rate of change of distance w.r.t time.

Distance in terms of t is given by,

s(t) = -t^3+3t^2+7t +4

Derivate w.r.t. time,

v(t)=s'(t) = -3t^2+6t+7

It is a quadratic function so its maximum is at vertex of the function.

The x point of the function is given by,

x=-\frac{b}{2a}

Where, a=-3, b=6 and c=7

t=-\frac{6}{2(-3)}

t=-\frac{6}{-6}

t=1

As 1 lie between interval [0,4]

Substitute t=1 in the function,

v(t)= -3(1)^2+6(1)+7

v(t)= -3+6+7

v(1)=10

Th maximum velocity is 10 ft/s.

Therefore, the maximum velocity of the object in the time interval [0, 4] is 10 ft/s.

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I solved this by a simple trial and error by inputing each answer into the equation.
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Graph the following two lines.
irina [24]

Answer:( 2 , 1 )  is a solution

Step-by-step explanation:

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