Answer:
HIV attacks a specific type of immune system cell in the body. It's known as the CD4 helper cell or T cell. When HIV destroys this cell, it becomes harder for the body to fight off other infections.
Explanation:
1) Charges
2) Vectors
86.6 m/s
vₓ = v cos θ
vₓ = 100 m/s cos 30°
vₓ = 86.6 m/s
A) heterogeneous mixture & I believe B?
I know A is correct though