# John Parry

Maths nerd turned maths tutor!

2725Students helped
£30Per hour
Maths

Asked by Selina · 5 years ago

What is the difference between a variable and a constant?

A constant is held constant (as the name suggests), where as a variable is a number that is aloud to change. For instance, if we let y=5+x, here, 5 is constant because it does not change, where as x is aloud to vary. For instance, we could consider x over a certain range, say x=1, x=2, x=3 and get a different y for respective x. Hope this helps.

Maths

Asked by Clara · 4 years ago

How do you use the sine rule?

This is easiest explained with an diagrams, but as I cannot, I’ll try make this as clear as possible. We have some triangle, with angles A, B and C and side lengths a, b and c, where the length a is OPPOSITE the angle A, b is OPPOSITE B etc. Now, the sine rule states a/sin(A) = b/sin(B) = c/sin(C). What is this actually telling us? Well, we say we know two lengths a and b and the angle A, then w... more

Maths

Asked by David · 4 years ago

F (x)=x^3-7x^2-24x+18 Sketch the graph of the gradient function y=f'(x). Use algebraic methods to determine any points where the graph cuts the coordinate axes and mark these on the graph. Use calculus, find the coordinates of any turning points on the graph. I don't know how to answer this question. Please help!?

Cuts the x-axis at x ={-3, 5+sqrt(19), 5-sqrt(19)} Turning points occur at x={-4/3, 6} Found by setting f’(x)=0 (taking the first derivative and setting =0 gives turning points)

Maths

Asked by Hannah · 2 years ago

3n+2 sequence?

Unsure of the question, but assuming you're asking what the terms of the sequence are, and assuming we take n to be running through the natural numbers, then the sequence generated is {5,8,11,14,17,...}.

Physics

Asked by Umar · 4 years ago

I'm learning physics at a GCSE grade level, and I wanted to ask, what exactly is resolving forces and why do we use it? (New spec 9-1)?

We resolve forces in Classical Mechanics to simplify our problems. For instance, let us say we have a block on a table. We would pick our x-axis to be along the table, and our y-axis to be perpendicular to the table (so at right angles). Then, if the block is pulled by a piece of string at some angle to the table, say 45 degrees, the block will have part of the tension (T) in the x-direction (Tcos... more

# John Parry

Maths nerd turned maths tutor!

2725Students helped