These cards are put into a bag: 1 2 3 4 5 6 7 8 9 10
One card is chosen at random.
a)
What is the probability of choosing the card with the number 4?
b)
What is the probability of choosing a card that has a digit 1 on it?
c)
What is the probability of choosing a card that does not have a digit 1 on it?
Give your answers as fractions.

Given that abcd is a rhombus, what is the value of x?

Cd is the perpendicular bisector of both xy and st, and cy=20. find xy.

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).