Top answers

Make a the subject of a + 3 = (2a + 7) / r

Multiply both sides by r: ra+3r = 2a + 7Move a to one side: ra -2a = 7-3rFactorise left hand side: a(r-2) = 7-3rMultiply both sides by (r-2): a= (7-3r) / (r-2)
TG
Answered by Tilly G. • Maths tutor
4437 Views

Solve 5x^2 = 10x + 4 Give your answers to 2 decimal places. [4 marks]

5x^2 = 10x + 4 5x^2 - 10x = 4 5x^2 - 10x - 4 = 0 ax^2 +bx +c = 0 x = (-b (+/-) ( b 2 -4ac) 1/2 ) /(2a) x = (--10 (+/-) ((-10) 2 - (4 x 5 x -4)) 1/2 )/(2 x 5) x = (10 (+/-) (100 + 80) 1/2 )/10 x = (10 (+/-) (...
JT
Answered by JOSHUA T S. • Maths tutor
7382 Views

Vous décrivez là où vous habitez pour votre blog. Ecrivez environ 100 mots en français

J’habite dans une ville dans le sud-ouest d’Angleterre, qui s’appelle Bath. Bath est une ville extrêmement vieille, elle est plein de magasins et il y a une cathédrale historique. J’habite au centre ville, e...
LJ
Answered by Lily J. • French tutor
5314 Views

A satellite is in orbit of the Earth, and moves at a constant orbital speed of 3055.5m/s. If it is at an altitude of 35786km, calculate the time period for a complete cycle, giving your answer in hours. Answer should be given in in 3 significant figures.

Orbital Speed = [2Π(Orbital Radius)]/Time Period 3055.5m/s = 10999.8km/h therefore: 10999.8km/h = [2Π(35786km)]/TT = [2Π(35786km)]/(10999.8km/h)T = 20.4 hours
Answered by • Physics tutor
3033 Views

Describe how starch is digested mechanically and chemically from the time we eat it in our mouth until it reaches our small intestine where it's absorbed.

The food firstly is mechanically digested in the mouth by the action of our teeth and tongue when we bite and churn it around. The saliva secreted in our mouth contains amylase which chemically breaks down t...
LP
Answered by Louise P. • Biology tutor
5083 Views