Please help me with this ASAP

If there are 12 moths and some have 31 days and others have 30 days how many have 28 days?

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)

What are the domain and range of the function f(x)=2^x+1