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Zigmanuir [339]
3 years ago
9

a contractor finds that crew A takes 5 1/2 hours to construct a retaining wall and crew B can do the same job in 8 1/2 hours. if

crew A and crew B work together how long will it take them to construct the retaining wall
Mathematics
1 answer:
o-na [289]3 years ago
4 0

Answer:

14hrs

Step-by-step explanation:

5 1/2+8 1/2

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Answer:

x=2

Step-by-step explanation:

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What is the integral of 1/(y²-1)
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Hello here is a solution : 

3 0
3 years ago
(a) The position of a particle at time t is s(t) = t^3 + t. Compute the average velocity over the time interval [7, 12].(b) Esti
ryzh [129]

Answer:

<h2>a) Average velocity = 278 units</h2><h2>b) Instantaneous velocity at t = 7 seconds is 148 units</h2>

Step-by-step explanation:

a) Average velocity is the ratio of displacement to time.

   We have

              s(t) = t³ + t

    t is in between 7 and 12

             s(7) =  7³ + 7 = 350

              s(12) = 12³ + 12 = 1740

    Displacement = 1740 - 350 = 1390

   Time = 12 - 7 = 5

  Displacement =  Average velocity x time

  1390 = Average velocity x 5

  Average velocity = 278 units

b) s(t) = t³ + t

   Differentiating

         v(t) = 3t² + 1

  At t = 7

          v(t) = 3 x 7² + 1 = 148 units

  Instantaneous velocity at t = 7 seconds is 148 units

8 0
3 years ago
Solve pls brainliest
Murrr4er [49]

Answer:

-1, -24

Step-by-step explanation:

-9-(-8)

double negative = positive

-9+8=-1

21-45=-24

6 0
2 years ago
What is the slope of slope =12;(7,84)
snow_tiger [21]

Answer:

e

Step-by-step explanation:

e

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2 years ago
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