Top answers

Outline how antibiotics offer protection from certain forms of infectious disease.

Ever since the accidental discovery of Penicillin by Alexandre Fleming in 1928, antibiotics have revolutionised modern medicine. Also known as 'anti-bacterials' they are used to treat often deadly bacterial ...
DR
Answered by David R. • Biology tutor
5315 Views

“President Truman was a success abroad, but a failure at home.” Assess the validity of this view.

INTRO : Truman was President from 1945 to 1952, overseeing the emerging Cold War, in which he solidified American control of Western Europe and began the fight of containing communism - to good success. Howe...
TS
Answered by Toby S. • History tutor
18090 Views

Differentiate y=(x-1)^4 with respect to x.

Using the chain rule, differentiate the "outside function" and the "inside function", and multiply the two results to get:dy/dx = 4(x-1)^3 * 1 = 4(x-1)^3
SH
Answered by Samuel H. • Maths tutor
5583 Views

Estimate (!) the number of atoms in the Sun given that it takes the light about t=8.3 min to reach us.

Use the following constants: light speed in vacuum c=3 10^8 m/s , gravitational constant G=6.67408 × 10^{-11} m^3 kg^{-1} s^{-2} and Avogadro's constant A =6.02214086 × 10^{23} mol^{-1}.Assuming that Earth m...
AV
3413 Views

When do I use Ser and Estar

'Ser' is used for: Descriptions, Occupations, Characteristics, Time, Origins and Relationships'Estar' is used for: emotions, physical or mental conditions, locations, positions and actions In general, 'ser' ...
HB
Answered by Hugo B. • Spanish tutor
3014 Views