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Solnce55 [7]
3 years ago
12

An object is dropped from a height of 400 feet. The amount of time, in seconds, the object takes to hit the ground can be found

by solving the equation -16t^2+400=0 . How many seconds will it take to hit the ground?
Mathematics
1 answer:
lidiya [134]3 years ago
6 0

-16t^2+400=0

16t^2=400

take square root on both sides.

\sqrt{16t^2} =\sqrt{400}

4t=20

t=20/4

t=5

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find the least perfect square that is exactly divisible by each of the numbers 5 , 18 , 25 and 27 . ​
Dimas [21]
<h3>☂︎ Answer :- </h3>

  • 8100
<h3>☂︎ Solution :- </h3>

  • LCM of 5 , 18 , 25 and 27 = 2 × 3³ × 5²
  • 2 and 3 have odd powers . To get a perfect square, we need to make the powers of 2 and 3 even . The powers of 5 is already even .

In other words , the LCM of 5 , 18 , 25 and 27 can be made a perfect square if it is multiplied by 2 × 3 .

The least perfect square greater that the LCM ,

☞︎︎︎ 2 × 3³ × 5² × 2 × 3

☞︎︎︎ 2² × 3⁴ × 5²

☞︎︎︎ 4 × 81 × 85

☞︎︎︎ 100 × 81

☞︎︎︎ 8100

8100 is the least perfect square which is exactly divisible by each of the numbers 5 , 18 , 25 , 27 .

7 0
2 years ago
Please help me out! :)
skad [1K]
3x-11=x+23
-x -x
2x-11=23
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x=17

3(17)-11 17+23
=40 =40

explanation ;
you would equal them because they are congruent . & you substitute x for 17 in each equation to find out the degrees of both of the angles :)

8 0
3 years ago
Which expression is equivalent to (7-8) (78)?
Gre4nikov [31]

-78

Step-by-step explanation:

(7-8)(78)

(-1)(78)=-78

8 0
2 years ago
2 is subtracted from a number and then the difference is multiplied by 5 the result is 30 find the number
trapecia [35]
Answer is 8 because you divide 30 by 5 then you get 6 and when you get 6 you add 2 and the answer is 8
3 0
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FinnZ [79.3K]

Answer:

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Step-by-step explanation:

6 0
3 years ago
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