Top answers

Given 6x+2y=4 and 5x+y=8, solve the simultaneous equations to find x and y.

The key here is to eliminate one of the variables; it doesn't matter whether we start by trying to get rid of x or y we will arrive at the same solution. For us to eliminate either x or y it is easiest to fi...
RM
Answered by Rebecca M. • Maths tutor
8666 Views

Given y=(1+x^3)^0.5, find dy/dx.

In order to solve this question, we need to use the chain rule when differentiating. The chain rule formula is dy/dx= (dy/du) (du/dx). Let u=1+x 3 Differentiating with respect to x gives du/dx=3x 2 We now ha...
RM
Answered by Rebecca M. • Maths tutor
6293 Views

What are the advantages provided to plant cells by having a cell wall?

Cell walls provide plant cells with protection and structure. Protection may be from adverse conditions or from biotic threats like fungi or bacteria. The structure of the plant is dependent on the presence ...
PO
Answered by Peter O. • Biology tutor
8442 Views

When do you use 'sein' and when do you use 'haben' in the past tense?

When forming a sentence in the past, or perfect tense in German, it is always formed with a conjugation of 'sein' or 'haben', plus the past participle of the main verb. It is much more common to use the verb...
AH
Answered by Alana H. • German tutor
5639 Views

How do I analyse sources?

Sources play a vital role in the study of History. It is important to know how to engage with the sources correctly and use them appropriately in an answer. The three main things to remember are: 1) What is ...
LB
Answered by Liliane B. • History tutor
4127 Views