What's the radius of a circle with an area of 64 square feet?

a. 4.51 ft.
b. 20.38 ft.
c. 5.41 ft.
d. 41.5 ft.

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.)

Me! last question, and i'm stuck! write the algebraic expression that models the word phrase. the product of 2 divided by the number h and 8 more than the number k

Find the midpoint m of z1=(8+5i) and z2=(12+3i)