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2 years ago

I can really use some help:)

Mathematics

2 answers:

Leona [35]2 years ago

8 0

You do -5( 3+4)

-5(7)
-35

icang [17]2 years ago

7 0

You first have to multiply the exponent into the other numbers
so -5×3=(-15)
and -5×4=(-20)
and (-20)+(-15)=(-35)
The value of the expression is A which is -35

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Determine the average speed of the current in a river if a boat moves at 20 miles/hour in still water and takes 3 hours to trave

Taya2010 [7]

The speed of the current in a river is 6 miles per hour

Solution:

Given that,

Speed of boat in still water = 20 miles per hour

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Distance downstream = 78 miles

To find: Speed of current

If the speed of a boat in still water is u km/hr and the speed of the stream is v km/hr, then:

Speed downstream = (u + v) km/hr

Speed upstream = (u - v) km/hr

Therefore, speed downstream is given as:

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We know that,

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