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I'm struggling with an FP2 First-Order Differential Equations Question (Edexcel June 2009 Q3) and the topic in general!

(In terms of formatting, we'll use y' to represent dy/dx, exp() to represent the expoential e^(), int() to represent integration with respect to x, and 1ODE to mean First-Order Ordinary Differential Equation...
LB
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Describe the differences between the primary and secondary immune responses in terms of B cells and antibody production. Include in your answer a definition of an antibody.

Antibodies are produced by B cells, mostly by plasma cells, in response to signals from other cells of the immune system. They are also known as immunoglobulins and have a Y shaped structure. When the immune...
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Answered by Hannah B. • Biology tutor
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Katie, Jackie and Charlie bake cookies. Katie has baked 8 more cookies than Charlie. Jackie has baked 5 more cookies than Katie. Altogether they have baked 72 cookies. How many cookies did Jackie bake?

K = C + 8 → C = K - 8 J = K + 5 J + K + C = 72 (K + 5) + K + (K - 8) = 72 3K - 3 = 72 3K = 75 K = 25 J = 25 + 5 = 30 C = 25 - 8 = 17
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Answered by Ina J. • Maths tutor
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What structure should we use to answer an exam question?

Whilst there is no one way of answering a question, it is important that you hit the necessary criteria to reach the higher bands of the grading system. To do that, using a methodical structure such as a PEE...
OG
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Describe the use of harmony and tonality to express a non-musical subject in Vivaldi’s The Four Seasons. Use detailed examples from at the movement 'Spring', whilst making comparisons with other movements.

The opening of the Spring concerto depicts the arrival of this joyous season through the bright key of E major. The basso continuo plays a tonic pedal to reinforce tonic and dominant harmony, typical of the ...
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Answered by Gabrielle W. • Music tutor
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