A) 3x+4=21
3x=21-4
3x=17
x=17÷3
x= 5.7
If n is odd then its cube is also odd because odd times odd is odd. When we add 5, an odd number, we get an even number.
If n is even, its cube is also even so adding an odd number makes the sum odd. So if the expression is odd, n must be even.
D I am pretty sure that it is D
Y=m+6 should be the correct answer
Six tenths. Hope that helps
