3 years ago

In two years time I will be three times as old as my brother who is 2. When I am 13 he will be ?

Mathematics

1 answer:

valkas [14]3 years ago

4 0

Answer:

Step-by-step explanation:

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what should be done to both sides of the equation in order to solve 1/3 x = 4? multiply by 4, divide by 4, multiply by 1/3, divi

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Answer:

Divide 1/3

Step-by-step explanation:

To get rid of the 1/3 fraction on x, we want to multiply by 3 or divide by 1/3

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3 years ago

When Klorina swims with the current, she swims 10 km in 2 h. Against the current, she can swim only 8 km in the same time. How f

nasty-shy [4]

Answer:

Klorina's rate in still water is 4.5 km/h

Current's rate is 0.5 km/h

Step-by-step explanation:

Let

x km/h = Klorina's rate in still water

y km/h = current's rate

<u>With the current (current helps):</u>

Distance = 10 km

Time = 2 hours

Rate = x + y km/h

$10=2(x+y)$

<u>Against the current:</u>

Distance = 8 km

Time = 2 hours

Rate = x - y km/h

$8=2(x-y)$

Divide both equations by 2:

$x+y=5\\ \\x-y=4$

Add these equations:

$x+y+x-y=5+4\\ \\2x=9\\ \\x=4.5\ km/h$

Subtract these two equations:

$(x+y)-(x-y)=5-4\\ \\x+y-x+y=1\\ \\2y=1\\ \\y=0.5\ km/h$

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3 years ago

Write an expression to represent Vivian's change in elevation from -9.6 feet at the bottom of the Ferris wheel to 12.3 feet at t

Lina20 [59]

Answer:

12.3 – (-9.6)

Step-by-step explanation:

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3 years ago

100 Points

kakasveta [241]

Answer:

Step-by-step explanation:

f(-x) is a reflection of f(x) in the y-axis

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Read 2 more answers

The ratio of minutes to dry and minutes to

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Answer:

56:42 (i hope this is right)

Step-by-step explanation:

I divided 56 and 4 which makes 14. Then I multiplied 14 and 3 to get 42. So 56 by 42.

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3 years ago