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x is an integer such that ‎1≤x≤9, Prove that 0.(0x)recurring=x/99

r=0.0 . x . r=0.0x0x0x0x.... 100r=x.0x0x0x (1) 10,000r=x0x.0x0x0x (2) (2) - (1): 9,900r=x00 r=x00/9,990 r=x/99
EE
Answered by Ellie E. • Maths tutor
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Which renewable energy methods are the best?

This depends on what "best" means, but generally this boils down to location. As an example, consider geothermal energy. This is derived from heat sources inside the Earth. Some places, such as Ice...
CW
Answered by Callum W. • Physics tutor
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If Newton's third law is correct, why are walls not indestructible? In applying a force to a wall, if it breaks surely it is not giving an equal and opposite force.

It is best to consider this in slow motion. First we have a wall which is at equilibrium (no external forces/all forces are balanced). Someone decides that the wall is in its way and wants to break down the ...
CW
Answered by Callum W. • Physics tutor
5356 Views

Bob and Brenda are both heterozygous for a genetically inherited recessive trait. (a) Calculate the probability that they would have a healthy child. Use a genetic diagram to help. (b) Suggest an example of a recessive inherited disorder

Heterozygous means that the parents both carry a dominant allele (A) and a recessive allele (a). Dominant alleles are always expressed in the phenotype. Recessive alleles are expressed in the phenotype only ...
CM
Answered by Charlotte M. • Biology tutor
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Neurons do not make direct contact but are separated by synapses. Impulses cross a synapse by means of a neurotransmitter. Describe the process of neurotransmitter release at a synapse. You may use a labelled diagram.

Action potential arrives at axon terminal of presynaptic neuron Voltage-gated Ca2+ channel opens Ca2+ enters the cell Ca2+ signals to vesicles Vesicles move to the membrane Neurotransmitters are released by ...
CM
Answered by Charlotte M. • Biology tutor
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