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The mass, m grams, of a substance is increasing exponentially so that the mass at time t hours is m=250e^(0.021t). Find the time taken for the mass to double in value.

All exponential equations can be reduced to the form m=m 0 e kt , where m 0 is the initial mass. This means for our equation the initial mass is 250g. If the mass has doubled in size, then m now equals 2*250...
TJ
Answered by Tom J. • Maths tutor
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How can I determine the stationary points of a curve and their nature?

For example, y = 3x 3 + 9x 2 + 2. Determine the stationary points and their nature. Let's remind ourselves what a stationary point is, and what is meant by the nature of the points. A stationary point is a p...
TD
Answered by Tutor87017 D. • Maths tutor
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What is the difference between aerobic and anaerobic respiration?

Aerobic respirtation is the process by which glucose and oxygen go to form carbon dioxide and water. The reaction occurs in the mitochondria. The process is needed to release energy. The chemical equation of...
AH
Answered by Aiden H. • Biology tutor
7807 Views

Find all the solutions of 2 cos 2x = 1 – 2 sinx in the interval 0 ≤ x ≤ 360°.

We know that having cos and sin functions in a question is going to cause us problems - we need a single function of x. So, step 1, we need to rewrite sin or cos in terms of the other. How do we choose which...
NH
Answered by Nicola H. • Maths tutor
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A company plan to produce GM mosquitoes which carry a gene that causes the death of offspring before reaching adulthood. Male mosquitoes do n't feed on blood, so scientists are planning on releasing millions of GM males. Do you think they should?

I will, through the format of a venn diagram or mind map, guide the student through brainstorming important points. I will pay particularly close attention to those listed in the Higher GCSE AQA 2017 Biology...
RL
Answered by Rhiannon L. • Biology tutor
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