Ms. Turner takes 5 hours to drive 390 kilometers from her home to the next city. If Ms. Turner’s average speed for the first 2 hours is 60 kilometers per hour, find her average speed for the last 3 hours.

Evaluate cos2θ for cosθ = square root of 3/2

Carley bought a jacket that was discounted 10% off the original price. the expression below represents the discounted price in dollars, based on x, the original price of the jacket.

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.