Top answers

How do you simplify expressions involving different powers?

Let's answer the question by solving an example: Take (8x 2 * 5x 4 * 2y 3 )/(20x 3 ). Firstly, let's take a look at the first bracket and rearrange it so we have both numbers and variables grouped together: ...
PW
Answered by Patryk W. • Maths tutor
4000 Views

What caused the outbreak of World War Two in 1939?

Historians acknowledge many factors causing the outbreak of war in 1939, however it is a culmination of these factors that must be seen as the ultimate cause in triggering the beginning of World War Two. It ...
AT
Answered by Amie T. • History tutor
4065 Views

Explain why the first ionisation energy of Strontium is less than the first ionisation energy of Calcium

Both of these elements are part of the 2nd group of elements on the periodic table. ie in first ionisation, their electron configuration changes from nS2 -> nS1. Strontium is a much larger element, so the...
OH
Answered by Olivia H. • Chemistry tutor
10933 Views

Given y=x^3-x^2+6x-1, use diffferentiation to find the gradient of the normal at (1,5).

dy/dx = 3x^2-2x+6 At (1,5), dy/dx = 7. 7 is the gradient of the tangent, therefore the gradient of the normal at (1,5) is -1/7.
KR
2919 Views

What is the present subjunctive and when is it used?

The subjunctive is a ' mood ', not to be confused with ' tense ' since a mood can have more than one tense. The present form of the subjunctive is the most common in French today; there is also an imperfect ...
TJ
Answered by Tabitha J. • French tutor
5116 Views