Show that any integer n > 12 can be written as a sum 4r + 5s for some nonnegative integers r, s. (this problem is sometimes called a postage stamp problem. it says that any postage greater than 11 cents can be formed using 4 cent and 5 cent stamps.)

Isee the amount was $90.00 then reduced to $75.00 , what is the percent ?

In a school 2/3 of the students study a language of those who study a language 2/5 study french

The magnitude, m, of an earthquake is defined to be m=log l/s, where i is the intensity of the earthquake (measured by the amplitude of the seismograph wave) and s is the intensity of a “standard” earthquake, which is barely detectable. what is the magnitude of an earthquake that is 1,000 times more intense than a standard earthquake? use a calculator. round your answer to the nearest tenth.