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Two apples and three bananas cost a total of £1.30. Seven apples and one banana cost a total of £1.70. Find the cost of a) one apple and b) one banana.

First, look at the key information from the question and form an equation for each of the first two sentences. These equations are as follows (let a represent the number of apples and b represent the numb...

JS
Answered by James S. Maths tutor
17059 Views

Find the values of A between and including 0 and 360 degrees for tan(2A) = 3tan(A)

You cannot work with this equation in the current form so you must use identities to find an equivalent form that you can work with. It is known that tan(2A) = 2tan(A) / 1-tan2(A) so set this e...

DM
Answered by Daniel M. Maths tutor
5537 Views

Express the equation cosecθ(3 cos 2θ+7)+11=0 in the form asin^2(θ) + bsin(θ) + c = 0, where a, b and c are constants.

We must first use the identity cosecθ = 1/sinθ. Now the equation becomes (1/sinθ)(3 cos 2θ+7)+11=0. Since we know that the question is asking for the answer in the form of asin2θ + bsinθ + c = ...

GL
Answered by George L. Maths tutor
6840 Views

Explain why for any constant a, if y = a^x then dy/dx = a^x(ln(a))

So let's start with taking the natural log on both sides of y=ax, giving us ln(y) = ln(ax). Using the laws of logarithms we can write this as ln(y) = xln(a).Next, we differentiate bo...

JM
Answered by James M. Maths tutor
13008 Views

Find the coordinates and determine the nature of the stationary points of curve y=(2/3)x^3+2x^2-6x+3

  1. Stationary points occur when dy/dx=0, therefore determine dy/dx first:
    dy/dx= 2x2 + 4x - 6
    2) solve dy/dx=0 for two values of x (using quadratic formula, if necessary):
    (x+...
BV
Answered by Barbora V. Maths tutor
3571 Views

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