Top answers

Find the first 3 terms, in ascending powers of x, of the binomial expansion of (2 – 9x)^4 giving each term in its simplest form.

(2-9x)^4 [2(1-4.5x)]^4 (2^4)(1-4.5x)^4 Using the binomial expansion formula 16[1+(4*(-4.5x))+(((4*(4-1))/(1 2))) (-4.5x)^2] 16[1-18x+121.5x^2] 16-288x+1944x^2
LJ
Answered by Lauren J. • Maths tutor
8482 Views

Describe the changes in pupil size when light is shined into the eye. Explain why this happens.

The pupil constricts (becomes smaller) to decrease the light entering the eye. This prevents damage to the eye.
MK
Answered by Melissa K. • Biology tutor
3671 Views

how does oxidative phosphorylation work in aerobic respiration

So this part is the last stage of respiration and you will probably ask yourself whats the point of all the NADH and FADH produced during the previous reactions ie Glycolysis producing (per glucose molecule)...
NM
Answered by Negin M. • Biology tutor
2869 Views

How to find gradient of functions

To find the gradient of a function, that has constant gradient you pick any two points. You label both the x and y co-ordinates of these two points.Then you subtract the y co-ordinates of these two points. Y...
SH
Answered by Sinan H. • Maths tutor
4414 Views

A car of mass m is travelling at a speed v around a circular track of radius r banked at an angle θ. (a) What is the centripetal acceleration of the car? (b) What is the normal force acting on the car? (c) If θ = 45°, r = 1 km what is the maximum speed?

(a) The formula for the centripetal acceleration of an object undergoing circular motion at a radius r and speed v is a = v^2/r so as F = ma the centripetal force is F = mv^2/r. 2 marks By drawing a diagram,...
JM
Answered by Jack M. • Physics tutor
7760 Views