Select all the expressions below which represent a 20% discount off the price of an item that originally costs d dollars.

A. 0.8d

B. d-0.2

C. d-0.2d

D. 1-0.2d

Newton's first law of motion states that an object at rest or moving with constant velocity will remain that way until it is acted on by an outside force true or false

A seed packaging company purchases 40% of their beans seeds from supplier A and 60% from supplier B and mixes these seeds together. If the bean seed comes from supplier A, the probability it will germinate is 85%.

Which variable goes on the x-axis? A. the controlled variable B. the independent variable (manipulated variable) C. the depenedent variable (responding variable)

Given that the tensile strength of aluminum foil is 311 megapascals, its thickness is approximately 15.0 micrometers, and a roll of household aluminum foil is 30.

Which of the following accurately describes properties of valence? A. The greater the number of electrons an atom has to borrow or to lend, the greater the activity of the atom. B.

A stationary speed gun emits a microwave beam at 2.10*10^10Hz. It reflects off a car and returns 1030 Hz higher. What is the speed of the car?

Discuss the changes in potential energy and kinetic energy and total energy for skateboarder going up and down on a half pipe ramp

The diagram below shows rock is affected when water enters cracks in rock, freezes and becomes ice

A vertical piston-cylinder device contains a gas at a pressure of 100 kPa. The piston has a mass of 5 kg and a diameter of 12 cm. Pressure of the gas is to be increased by placing some weights on the piston.

Evaluate the force of a skateboard exerts on you if your mass is 60kg and you push on the skateboard with a force of 60N