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ivanzaharov [21]
3 years ago
6

Please help me fast

Mathematics
1 answer:
My name is Ann [436]3 years ago
7 0

Step-by-step explanation:

5-(-2)

5+2 (a minus and a minus together gives a plus)

=7

9+ (-2)

9-2

=7 (a plus and a minus gives a minus)

Yes it will give you the same answer as a minus and a minus together gives a plus and a plus and a minus gives a minus

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6 lumberjacks can cut down 15 mahogany trees in 2 hours. How much longer will
Orlov [11]

9514 1404 393

Answer:

  3.5 hr

Step-by-step explanation:

We assume that "the same rate" means effort per tree is a constant. "Effort" is measured as the product of lumberjacks and hours. Then ...

  (lumberjacks)(hours)/trees = (6)(2)/15 = (8)(t)/35

Multiplying by 35/8, we have ...

  (35/8)(12/15) = t = (3·4·5·7)/(2·3·4·5) = 7/2 = 3.5

It will take 8 lumberjacks 3.5 hours to cut down 35 trees.

8 0
3 years ago
Can someone help me with Writing equations of lines
worty [1.4K]

Step-by-step explanation:

y=mx +c

given c = -8

a pont on line (-2,4)

subs all given info in formula to find m, the slope

4 0
3 years ago
How long is a guy wire reaching from the top of a 21ft. Pole to a point on the ground 15ft. From the pole
vovikov84 [41]

Answer:

26ft

Step-by-step explanation:

This would form a triangle so you would use Pythagorean theorem to find the hypotenuse ( the longest side )

5 0
3 years ago
Situation: A 25 gram sample of a substance thats used for to sterilize surgircal instruments has a k-value of 0.1205. N=Noe^-kt
Naya [18.7K]
Going by the formula, Half-Life = ln(.5) / k
Half-Life = .693147 / .1205
Half-Life = 5.75 days and rounded to nearest tenth,
Half-Life = 5.8 days

5 0
3 years ago
Mike's plant grew 3 inches last week. Lauren's plant grew 2 1/2 times this amount. how many inches did Lauren's plant grow last
soldier1979 [14.2K]
Mike's plant plant height grew by 3 in
Lauren's grew 2 1/2 times of 3 in

So, 2 1/2 times of 3 in
= 2 1/2 x 3
= 5/2 x 3
= 15/2 = 7 1/2 inches

Hope This Helps You;
3 0
4 years ago
Read 2 more answers
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