A torch & battery cost £2.50, the torch cost £1.50 more than the battery. What fraction of the total price is the torch?

Compare these two waves: the blue and orange waves have the same pitch, but the blue wave is louder. the blue and orange waves have the same volume, but the blue wave has a higher pitch. the orange wave has a higher pitch, but the blue wave is louder. the blue wave has a higher pitch, but the orange wave is louder.

An equation in slope-intersept form the lines that passes thought (-8,1) and is perpindicular to the y=2x-17.

What is the surface area of the sphere?