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You area told that y is proportional to x2 and that when y = 75, x = 5. a) Find a formula for y in terms of x. b) Find the value of y when x = 3. c) Find the value of x when y = 1200.

a) when y=75 x=5 and y is proportional to x^2, so the answer is y=___x^2 if x=5, then x^2 = 25, and 75/25=3, so the answer is y=3x^2 b) if x=3, x^2=9, if you multiply this by 3, you get the answer of 27. c)i...
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Answered by Millie B. • Maths tutor
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How do you use position words in Mandarin?

Some position words: 前边 qián - in front 后边 hòu - behind 左边 zuǒ - left 右边 yòu - right 上边 shàng - above 下边 xià - below 里边 lĭ - inside 外边 wài - outside Explanation: Word order is different in Chinese from what ...
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Answered by Serena C. • Mandarin tutor
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Solve the following simultaneous equations: x^2-y^2=9, x - y = 1

We first notice we have a linear and non linear equation. The simplest method to solve is to substitute the linear equation into the non linear equation and then solve for one of the unknowns. Then substitut...
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Answered by Shantu H. • Maths tutor
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How do you know whether to use the preterite tense or the imperfect tense?

That is a very good question, as both describe actions of the past. We use the preterite tense when we talk about actions which are seen as being completed in the past, notably one-off events. For example, y...
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Answered by Zoe S. • Spanish tutor
2899 Views

Make s the subject of the equation: 4st + 8 = 5r

To begin this question, we want to isolate the term containing the s, i.e. have the term containing the s by itself on one side of the equality. We do this by subtracting 8 from both sides. 4st = 5r - 8 To m...
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Answered by Sophie W. • Maths tutor
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