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vampirchik [111]
3 years ago
13

What is the solution set of the x^2+x-2>o

Mathematics
1 answer:
VMariaS [17]3 years ago
6 0

Answer:

x

2

−

x

−

2

=

0

Factor  

x

2

−

x

−

2

using the AC method.

Tap for more steps...

(

x

−

2

)

(

x

+

1

)

=

0

Set  

x

−

2

equal to  

0

and solve for  

x

.

Tap for more steps...

x

=

2

Set  

x

+

1

equal to  

0

and solve for  

x

.

Tap for more steps...

x

=

−

1




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Brian can lay a slab of concrete in 6 hours, while Greg can do it in 4 hours. If Brian and Greg work together, how long will it
anastassius [24]

Answer:

2 2/5 hours

Step-by-step explanation:

In 6 hours Brian can lay 1 slab of concrete

dividing both side by 6

in 6/6 hours Brian can lay 1/6 slab of concrete

Thus, in 1 hour  Brian can lay 1/6 slab of concrete

In 4 hours Greg can lay 1 slab of concrete

dividing both side by 4

in 4/4 hours Greg can lay 1/4 slab of concrete

Thus, in 1 hour  Greg can lay 1/4 slab of concrete

Thus, total part of slab laid by both in 1 hour when they work together

1/6 + 1/4 = 4+6/(6*4) = 10/24 = 5/12

5/12 of slab of concrete is laid by both of them in 1 hour

time taken to lay 5/12 of slab = 1 hour

dividing both side by 5/12

time taken to  5/12/ 5/12 of slab = 1/5/12 hour = 12/5 hours

time taken to 1/1 of slab = 12/5 hours = 2 2/5 hours

Thus,

it takes 2 2/5 hours to lay the full slab of concrete when Brian and Greg work together,

5 0
3 years ago
A human body that is performing light work generates about 650 BTUs of body heat per hour. If a room that is 10 ft × 12 ft × 9 f
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19. Find the pressure exerted by a force of 240 newtons on an area of 30cm? Please help I will mark as brilliant
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Answer: 80000

Step-by-step explanation:

p=<u>f </u>

    a

<u>24</u>

0.003

NOTE:30  ÷10000=<u>0.030km</u>

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3 years ago
A quickie. If n identical dice are rolled, number of possible outcomes are?
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In rolling one die, there are 6 possible outcomes because each die has 4 faces. The number of outcomes when rolling n dice is equal to 6^n. By this, the number of outcomes when 2 dice are rolled is 36, 216 for 3 dice, and so on. 
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