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The curve C is given by the equation x^4 + x^2y + y^2 = 13. Find the value of dy/dx at the point (-1,3). (A-level)

The most important thing to note about this question is that we must differentiate implicitly. We must differentiate each term with respect to x. Using our differentiation rules we can see that our first ter...
RK
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How many atoms are there in 0.75 mol of water? Give answer to 2 decimal places

Number of particles of water = avogadro constant x amount in molTherefore6.02 x10 23 x 0.75= 4.515 x10 23 There are 3 atoms in every molecule of water so we need to multiply the number of particles by 34.515...
AR
Answered by Alicia R. • Chemistry tutor
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What is the significance of the number e (Euler's number)?

The irrational number e is one of the most important numbers in mathematics. The value of it is 2.718... but since it is irrational that is e to 4 significant figure, only. How can we calculate this number? ...
SA
Answered by Soleiman A. • Maths tutor
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Explain why relations between the USA and USSR worsened in the years 1947-49.

The USA and USSR had been allies during WWII, but this relationship soon broke down and worsened in the late 1940s. One of the main reasons for this was the announcement of the Truman Doctrine in March 1947 ...
BM
Answered by Beatrice M. • History tutor
6977 Views

If -3x + 10y = -100 and 13x + 10y = 60, solve for x and y.

This can be solved simultaneously. This is about manipulating the equations until they're in a format that you can use.Label the equations:eq1: -3x + 10y = -100 and eq2: 13x + 10y = 60Now, eq1 - eq2 gives us...
OJ
Answered by Olyvia J. • Maths tutor
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