I need help with this question please!

Mathematics

1 answer:

katrin [286]3 years ago

5 0

Need help with what, i cant draw the scale for you lol.

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REASONING 9. and 10.

tatyana61 [14]

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4 years ago

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What is the value of x in the equation x – y = 30, when y = 15?

Andrei [34K]

x - y = 30
x - 15 = 30
+ 15 + 15
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A streamer goes downstream from point A to B in 9hrs .from B to A ,upstream it takes 10h .if the speed is 1km/hr , what will be

MA_775_DIABLO [31]

Answer:

$Speed\ of\ streamer\ in\ still\ water=19\ km/hr\\\\Distance=180\ km$

Step-by-step explanation:

$Let\ speed\ of\ steamer\ in\ still\ water=x\ km/hr\\\\Let\ distance\ between\ A\ and\ B=d\ km$

Downstream:

$Speed of stream=1\ km/hr\\\\Downstream\ speed=speed\ of\ steamer+speed\ of\ stream\\\\Downstream\ speed=x+1\\\\Time\ Taken=9\ hrs\\\\Distance=d\\\\Distance=speed\times time\\\\d=(x+1)\times 9\\\\d=9x+9\ ..................................................eq(1)$

Upstream:

$Speed of stream=1\ km/hr\\\\Upstream\ speed=speed\ of\ steamer-speed\ of\ stream\\\\Downstream\ speed=x-1\\\\Time\ Taken=10\ hrs\\\\Distance=d\\\\Distance=speed\times time\\\\d=(x-1)\times 9\\\\d=10x-10\ ..................................................eq(2)$