What’s the answer to a7 x a5 ?

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15

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)

Which expression do you get when you eliminate the negative exponents of 4a^2 b^216a^-3 b