∠c and ∠d are vertical angles with m∠c=−2x+90 and m∠d=x−30. what is m∠d? enter your answer in the box.

Explain how you might determine the rate of weathering on a sample rock

Which object has the least amount of kinetic energy? a. a car driving down a road b. a soccer ball rolling down a hill c. a bicycle locked to a bike rack d. a satellite orbiting earth

At the year's end, a share of ardex industries was worth $49.50. this was $9 less than three times its value at the beginning of the year. what was the price of one share of ardex stock at the beginning of the year?