This my test question i'm 100 bad at math 2b2+16b+49÷2b+4

Need this asap if anyone can i would be very grateful. if you could show workings that would really

The volume of a cube is 8 in to the 3rd power. how long is each side?

Celeste wants to have her hair cut and permed and also go to lunch. she knows she will need $50. the perm cost twice as much as her haircut and she needs $5 for lunch. how much does the perm cost?