The acceleration of a particle from a fixed point O along the X-axis is given by a(t) = 6t– 4t +2ms^2? Determine the velocity and displacement equation of the
particle given that v= -6ms and the displacement s=-15m at
t=0.​

Ineed with these last two questions: 1) what are two types of cold air masses that influence the weather in north america? name them and describe their humidity. 2) describe the motion of a cold air mass and a warm air mass and the weather you would expect at a warm front and an occluded front.

Assume you measured the mass of the cart to be (500 ± 1) g and the mass of the additional mass you put on the cart to be (500 ± 1) g as well. since the scale you are using in the lab cannot measure objects heavier than 600g you will have to sum up individual pieces and propagate the error. so what would be the mass and the standard error of the cart and the mass

Select the correct answer. what does the process of natural selection involve?