how many numbers divisible by 5 are possible, show your calculation. (Its a other language so dont look at the text)

Iwill give ! if m∠a=59 and m∠3=81°, what is m∠b? m∠b= _[blank]_°

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

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)