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DerKrebs [107]
3 years ago
14

Please help with this I need to get my math done!

Mathematics
1 answer:
azamat3 years ago
4 0
This answer would be A
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ritu can row downstream 20km in 2 hrs and upstream 4km in 2 hrs. find the speed of rowing in still water and the speed of the cu
Marina CMI [18]

Answer:

Speed of boat in still water is 6km/h

Speed of current is 4km/h

Step-by-step explanation:

We know speed = distance / time

Let the speed of boat in still water be x

Let the speed of current be y

Hence the speed of boat, down stream = x+y

Distance downstream = 20km

Time taken = 2 hours

We have

x+y=\frac{20}{2}

x+y=10       ......(1)

Speed of boat upstream = x-y

Distance upstream = 4

Time taken = 2

We have

x-y=\frac{4}{2}

x-y=2    ...(2)

Adding (1) & (2)

2x=12

x=6

Substituting in (1) we get

y=4

7 0
3 years ago
Brian has $100 in his pocket. As he is walking home 1/4th of the money falls out of his wallet. Of the remaining money, he uses
emmasim [6.3K]

Answer:

$40

Step-by-step explanation:

Brian starts at $100, then loses 1/4th of the money,

100/4 = 25,

then you subtract 25 from 100, which gives you 75

With the remaining $75, he spends $15 on girl scout cookies,

75 - 15 = 60

He then has $60 remaining, but while walking home, loses 1/3 of the total amount.

60/3 = 20,

you then subtract 20 from 60, which gives you 40

Therefore, $40 is what is remaining.

6 0
3 years ago
The number 16 has four fourth roots. In other words, there are four complex numbers that can be entered in the square in the equ
Tems11 [23]

Answer:

Step-by-step explanation:

Hello, we know that the z complex solutions of

z^4=1

are

1, i, -1, -i

so, the solutions of z^4=16=2^4 are

2, 2i, -2, -2i

Thank you

3 0
4 years ago
Simplify this expression<br> 12(4 + 6)-0(8-7)
postnew [5]

Answer:

48 +72- 0= 120 that is my simplification

5 0
3 years ago
In the diagram below DE is parallel to XY what is the value of Y ?
Lesechka [4]
B. 94 because it is the same as the other one
4 0
4 years ago
Read 2 more answers
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