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Paul Richardson

Resourceful tutor and undergraduate at The University of Manchester

1650Students helped
5Questions answered
£25Per hour
Science

Asked by Ismail · 2 years ago

Why do we have leap years?

It would be 24th November 2019 if there were none. a) What are leap years? Every year that is exactly divisible by four is a leap year, EXCEPT for years that are exactly divisible by 100, but these centurial years are leap years if they are exactly divisible by 400. For example, the years 1700, 1800, and 1900 are not leap years, but the years 1600 and 2000 are. So 3 leap years every 400 years are... more

Maths

Asked by Charis · 2 years ago

How do you find the equation of a line PERPENDICULAR to y=4x+2?

General equation of line y=mx+c 1. Find the gradient(m1) of the line. 2. Find the negative reciprocal(m2) of that: -1/m1(gradient) All lines with that negative reciprocal are perpendicular. (3.) If you want to find a particular perpendicular line, substitute, into general equation, the given (X, Y) coordinates and m2 (found in step 2), and use them to find c. This c will give you a unique equa... more

Maths

Asked by Mohammed · 2 years ago

SHOP A (normal price £85 1/3 off) SHOP B (normal price £80 30% off) in which shop are the trainers cheaper?

85-(85/3)=85-28.33=56.66 30% off 80 = 80*(1-0.3)=80*0.7=56 Shop B is cheaper

Maths

Asked by Ted · 2 years ago

10 students who play football and cricket 7 students who do not play football or cricket 14 students who play football 21 students who play cricket Find the probability that student chosen at random plays football and cricket?

Probability is #of students who play both/#of students total. I assume from the wording that the "students playing football" includes those who also play cricket and vice versa. Therefore there are 14-10=4 students who play only football and 21-10=11 students who play just cricket. Probability is 10/(10+7+4+11)=10/32=5/16

Maths

Asked by Jed · 2 years ago

How do you calculate the mass of a product produced using excess and relative formula masses?

You first convert your reagents to moles (divide mass by relative molecular mass), then use the chemical formula to determine the limiting reagents and the number of moles of product made when all the limiting reagent is used. Finally you multiply the number of moles of product by its relative molecular mass to get the mass of product

Paul's profile picture

Paul Richardson

Resourceful tutor and undergraduate at The University of Manchester

1650Students helped
5Questions answered
£25Per hour