What is the value of the expression -x + 3y, if x = 5 and y = -4?

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)

Identify the number 127 as a rational or irrational. explain

Find the solution of each of the following.