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frutty [35]
4 years ago
13

HELP WILL MARK BRAINLIEST HEEEELPPP!!!!!!!!! Four people need to cross a dark river at night.They have only one torch and the ri

ver is too risky to cross without the tourch. if all people cross simultanoesly then torch light wont be sufficient.Speed of each person of crossing the river is different.cross time for each person is 1 min, 2 mins, 7 mins and 10 mins. What is the shortest time needed for all four of them to cross the river ?
Mathematics
1 answer:
serg [7]4 years ago
5 0

Answer:

13 minutes

Step-by-step explanation:

Person 1: 1 min

Person 2: 2 min

Person 3: 7 min

Person 4: 10 min

Person 1, 3, and 4 cross first, which will take 10 minutes.

Then, Person 1 comes back, taking 1 minute.

Person 1 and Person 2 cross the river, taking 2 minutes.

10 + 1 + 2 = 13 minutes.

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Debora [2.8K]
If R = 5z
Then 15 z = 3R so there given 15z=3Y soo R= 5 Y
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3 years ago
Jessica is packing books for her move She has 93 books. Each box can fit 6 books. How many boxes does she need to move all of he
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Answer:

16

Step-by-step explanation:

93:6=15.5 As the box can't be half so 16 boxes. In 15 she will pack in each 6 books and in other box 3 books

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3 years ago
Read 2 more answers
Use a linear approximation to estimate the number (8.07)^2/3.
Tanya [424]
So let f(x) = x^(2/3) 
<span>Then let f'(x) = 2/3 x^(-1/3) = 2 / (3x^(1/3)) </span>

<span>When x = 8, </span>
<span>f(8) = 8^(2/3) = 4 </span>
<span>f'(8) = 2 / (3*8^(1/3)) = 1/3 </span>

<span>So near x = 8, the linear approximation is </span>
<span>f(x) ≈ f(8) + f'(8) (x - 8) </span>
<span>f(x) ≈ 4 + 1/3 (x - 8) </span>

<span>So the linear approximation for x = 8.03 is... </span>
<span>f(8.03) ≈ 4 + 1/3 (8.03 - 8) </span>
<span>f(8.03) ≈ 4 + 1/3 (0.03) </span>
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5 0
3 years ago
Read 2 more answers
Simplify : (-7/18 × 15/-7) - (1 × 1/4) + (1/2 × 1/4)​
bixtya [17]

Answer:

17/24

Step-by-step explanation:

This expression simplifies to the following:

-7     15        1          1

---- * -----  -  -----  +  -----

18     -7        4          8

Reducing the product, we get

  15        1

-------- - -----

  18        8

and this simplifies further:

 5       1

----- - -----

 6       8

The LCD is 24.  Thus, we have:

20      3         17

------ - -----  =  -----

24      24       24

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3 years ago
*Offering 50 points and brainliest to anyone can explain steps* (Pic attached)
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D because the shaded region has one side and subtract by pie and substitute to get this answer.
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