Item 12 seven out of every 8 students surveyed owns a bike. the difference between the number of students who own a bike and those who do not is 72. how many students were surveyed?

Prove the divisibility of the following numbers: 25^9 + 5^7 is divisible by 30.also, read as (25 to the power of 9) + (5 to the power of 7) is divisible by 30. blank x 30what is the blank? ( it should be expressed in exponent form)