How many unit cubes are needed to
make a model of a rectangular prism
that is 9 units long, 5 units wide, and
3 units high?
A 17 unit cubes
B 135 unit cubes
C 174 unit cubes
D 270 unit cubes

Initially 100 milligrams of a radioactive substance was present. after 6 hours the mass had decreased by 4%. if the rate of decay is proportional to the amount of the substance present at time t, find the amount remaining after 24 hours. (round your answer to one decimal place.)

7. if the value of x varies directly with the value of y, and x = 3 when y = 21. what is the valu y, and x = 3 when y = 21. what is the value of x when y = 105?

If x = -2, then x 2-7x+10 equals a. 0 b.20 c.28