Please help me, & show work, nice and clear, thank you so much

What is the absolute value of the complex number -4-sqrt2i

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)

Graph the equationy=x^2 -[tex]y = x^{2} - 2[/tex]