the sum of the reciprocals of two consecutive integers is equal to 21 times the reciprocal of the product of those integers. find the integers.

Louie drives his car 270 kilometers in the same time that derek drives his lancer 250 kilometers, if louie averages 4 kilometers per hour faster than derek, find their rates

Ryan and erin were both asked to put the number 612 462 on a place value chart, but they each came up with a different answer. which answer is correct? (imagine this was in a place value chart.) ryan’s: hundred thousands: 6 ten thousands: 1 thousands: 2 hundreds: 4 tens: 6 ones: 2 erin’s: hundred thousands: 6 ten thousands: 0 thousands: 12 hundreds: 4 tens: 6 ones: 2 doesn't erin adding the zero change the number because it adds a place value spot? even thought its value is zero?

Period of a 100mhz fm radio wave is roughly 1 x 10 raise to the power of -8 s​