Top answers

How do I find two prime numbers whose sum is 30?

We are looking for a sum of numbers- this means that both numbers have to be less than 30. Start by writing down all prime numbers less than 30: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29. Do you see any two numbers...
SN
Answered by Silke N. • Maths tutor
37286 Views

Solve x/(x-7) + 6/(x+4) = 1

Observe neither x=7 or x=(-4) are solutionsMultiply through by (x-7), x + 6(x-7)/(x+4) = (x-7)Subtract x, 6(x-7)/(x+4) = -7Multiply through by (x+4), 6(x-7) = -7(x+4)Therefore, 6x - 42 = -7x - 28Rearrange to...
LD
Answered by Lewis D. • Maths tutor
2885 Views

What are the key differences between eukaryote and prokaryote cells?

Key Eukaryote cell features: -DNA is circular within the cell nucleus-Larger than prokaryotes-Can be one cell or many-Membrane-bound organelles (e.g. mitochondria, chloroplasts)Key Prokaryote cell features: ...
KR
Answered by Katy R. • Biology tutor
2320 Views

Convert 60km/h to m/s

60x1000=60,000 (convert km into m)60,000/(60x60)= 16.67m/s (here we divide the 60,000m by the number of seconds within an hour, which is 3600)Final answer is therefore 16.67m/s
RL
Answered by Rebecca L. • Maths tutor
16809 Views

How are the lungs specialised for gas exchange?

They have a high surface area to volume ratio allowing for more gas exchange to take place. The large surface area to volume ratio is partially to do with them having lots of alveoli. Alveoli have a 1 cell t...
RL
Answered by Rebecca L. • Biology tutor
2496 Views