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I can't figure out last part please: A spring whose length is 7 cm stretches at 1/2 cm per 1 kg of suspended weight. 1) When 3 kg of weight is suspended, how many centimeters is the total length of...

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2. Study Group

Water poured in tank. Relation x (min) 5 10 15 20 25 y (cm) 10 20 30 40 50 1) express relation between x and y as equation   y= 2) How many centimeters is depth of water at 17 min? 3) How lmany cen...

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x + 3y = 7 5x + 3y = -1 I can't get the right answer, i don't know if to add or subtract, even when I know the answer is (-2, 3) could you please help me figure it out?

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2. Study Group

40 min to fill tank, 60 min to drain it. How long will it take to fill it if draining at the same time?  I come up with 1H 20 min is this correct?