Top answers

How does vaccination prevent infection?

1) Dead/Inactive/Attenuated Microorganisms activate immune response 2) White blood cells produce antibodies 3) Antibodies kill microorganisms 4) This allows for a faster response during reinfection
HS
Answered by Hans S. • Biology tutor
4925 Views

Nouns in Spanish have a gender. Is it hard to tell when a noun is masculin or feminine?

A big difference between Spanish and English is the fact that Spanish nouns have a gender, so, for instance, we would say that a table is feminine and a book is masculin. This is important because if a word ...
CR
Answered by Carmen R. • Spanish tutor
3945 Views

Solve the simultaneous equations: y = 4x^2 - 9x - 1 and y = 5 - 4x

Subtract the second equation from the first, giving you: 4x^2 -5x -6 Factorise the quadratic: (4x + 3)(x - 2) x = -0.75 x= 2 Now substitute these values into one of the equations (or both, just to double-che...
DA
Answered by Damilola A. • Maths tutor
10691 Views

Why is it not '我是好'? In basic adjectival sentences, why is the copula verb 'to be' not used?

Take the simple sentence 'I am good' - 'I' is the subject, 'am' is the first-person of the verb 'to be', and 'good' is the adjective.In English, the verb 'to be' is needed in adjectival sentences to link the...
KY
Answered by Kwan Yee L. • Mandarin tutor
8221 Views

How do we differentiate y=a^x when 'a' is an non zero real number

Firstly we must change it into a form we can deal with. To do this we take the natural log (ln) of both sides.ln(y)=ln(a x ) ln(y)=x(ln(a)) using our rules of logsFrom here we differentiate. The differential...
MJ
Answered by Marcus J. • Maths tutor
8561 Views