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How do I know if a word needs a preposition and if so how can I tell which one to use?

As with English, prepositions aren't needed in every sentence, however many nouns, verbs and adjectives do require one. Remember: they will affect the rest of a sentence grammatically. However, we can talk a...
RM
Answered by Rachael M. • German tutor
2367 Views

What are some differences between RNA and DNA?

RNA is single stranded, whereas DNA is double stranded. RNA has a uracil base instead of DNA's thymine base. RNA has a ribose sugar, whereas DNA has a deoxyribose sugar.
HG
Answered by Holly G. • Biology tutor
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How is blood pumped around the heart and to the body?

The pumping of the heart is split into two main phases, diastole (relaxation) and systole (contraction) and involves the four main chambers of the heart, the atria and ventricles, as well as the associated v...
RJ
Answered by Rhiannon J. • Biology tutor
3356 Views

Given y(x+y)=3 evaluate dy/dx when y=1

y(x+y)=3,yx +y 2 =3,Differentiating with respect to x,y+x(dy/dx) +2y(dy/dx)=0when y=1, x=3-1=2 (from original equation)1+2(dy/dx) +2(dy/dx)=0,dy/dx=-1/4
LP
Answered by Leto P. • Maths tutor
5157 Views

Explain the separation of powers found in the USA

The separation of powers is a system of shared power between three independent branches of government: the executive, judicial and legislative branches. Practically, the executive branch is run by the presid...
SO
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