I need help. Please!!!

1. A force of 85 N is needed to push a 10 kg mass up a 120 ramp with an acceleration of 2.5 m/s'. What is the coefficient of friction (H) between the ramp and the object? 2. An object is placed on a 510 ramp. If the coefficient of friction between the object and the ramp is 0.20, what is the object's acceleration? 3. A 10 kg mass rests on a 35 ramp. A 15 N force tries to push the mass down the ramp. If the coefficient of friction between the ramp and the 10 kg mass is 0.155, what is its acceleration? 4. A 8 kg mass rests on a horizontal, friction-free surface. A 56 N force pushes it from the left, and a 92 N force pushes it from the right. A) What is the net force on the mass? B) What is its acceleration? 5. A 5 kg object is placed on a 310 ramp. If the coefficient of friction between the object and the ramp is 0.926, how much force is needed to push the object down the ramp with an acceleration of 4 m/s. 6. A force of 220 N is used to push the object shown below. Is the coefficient of friction is 0.21, what is the object's acceleration? 170 10 kg 7. Find the magnitude and direction of the net force when the following two vectors are combined: 200 N 150 N 40 80