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What is 45% of 60?

I would ask the student what they understood of percentages and if they understood the relationship between fractions and percentages. I would explain that 1% of a value is the same as 1/100 of a value. The ...
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Answered by Sophie N. • Maths tutor
7282 Views

Draw a dot and cross diagram to show HCl structure

I would first get the student to find the elements on the Periodic Table, and work out how many valence electrons each atom had. Then I would get them to draw the structures of hydrogen and chlorine using th...
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Answered by Sophie N. • Chemistry tutor
16015 Views

x^2 + y^2 + 10x + 2y - 4xy = 10. Find dy/dx in terms of x and y, fully simplifying your answer.

x 2 + y 2 + 10x + 2y - 4xy = 10 Start by differentiating both sides by x, the terms not containing y are differentiated normally, x 2 becomes 2x, 10x becomes 10, and 10 becomes 0. For the y 2 term, by implic...
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Answered by Guy L. • Maths tutor
15063 Views

Paul travels from Rye to Eston at an average speed of 90 km/h. He travels for T hours. Mary makes the same journey at an average speed of 70 km/h. She travels for 1 hour longer than Paul. Work out the value of T

As distance is equal to speed multiplied by time, the distance Paul has traveled is 90 multiplied by T, or 90T. As Mary is making the same journey, she travels the same distance. The distance she travels is ...
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Answered by Guy L. • Maths tutor
13725 Views

How does a HDD (Hard drive disk) work?

A HDD is a mechanical form of storage, using electromagnetism to store and write data. Mechanical drives are very prone to data lose and breaking when moved around, due to their mechanical nature. They consi...
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Answered by Harvey B. • Computing tutor
4543 Views