How many 4 digit number combinations can be made out of the number 1486

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.

Which of the following expressions are equivalent ?

Zahra runs a 500-meter race at a constant speed. which graph shows her distance from the finish line during the race?