Two circles are concentric, and have radius of 15 and 25 respectively. If two arcs are formed by the same central angle, which of the following are possible arc lengths? Select the two correct answers. 30 and 40

50 and 80

3 and 5

45 and 75

60 and 90

Each morning papa notes the birds feeding on his bird feeder. so far this month he has see. 59 blue jays, 68 black crows, 12 red robin's and 1 cardinal. what is the probability of a blue jay being the next bird papa sees

Is of - 4x + 2? a. 3 b. 4 c. 6 d. 5

Amass weighing 16 pounds stretches a spring 8/3 feet. the mass is initially released from rest from a point 2 feet below the equilibrium position, and the subsequent motion takes place in a medium that offers a damping force that is numerically equal to 1/2 the instantaneous velocity. find the equation of motion if the mass is driven by an external force equal to f(t)=cos(2t).