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Find the equation of the tangent to the curve y = (5x+4)/(3x-8) at the point (2, -7).

Firstly, we need to find the gradient at this point on the curve as the tangent will have the same gradient. So to find the gradient of the curve or in other words, dy/dx, we differentiate the equation. To d...
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Answered by Manika S. • Maths tutor
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Explain DNA replication (SL).

DNA replication is the process through which two new strands of DNA are synthesized from the original molecule and predominantly occurs in the S phase of the cell cycle prior to mitosis. To put it simply, we...
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Answered by Jordi M. • Biology tutor
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A ball is fired from a cannon at 20m/s at an angle of 56degrees to the horizontal. Calculate the horizontal distance the ball travels as well as its maximum height reached.

This is a typical mechanics question in an AS/A-level exam and uses the principles of SUVAT and projection. We can try to calculate the maximum height reached first using the veritical components. SUVAT: s=?...
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Answered by Aaron F. • Maths tutor
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How might an uncharged object become positively charged? (e.g. AQA Higher specimen paper 1)

Ask student what causes charge, i.e. motion of electrons. So answer is that electrons move away from the object leaving it positively charged, or move onto a neutral object leaving it negatively charged.
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Answered by Joanna W. • Physics tutor
15774 Views

Expand and simplify (6x+9)(4x+7)

Using the "crabs claw" or "parrot beak" method, draw lines linking the two brackets (demonstrated on whiteboard) 6x x 4x = 24x 2 6x x 7 = 42x 9 x 4x = 36x 9 x 7 = 63 Answer = 24x 2 + 42x ...
JG
Answered by Jenna G. • Maths tutor
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