A certain isotope has a half-life of 9 hours. If the
initial mass of the isotope is 20.8 mg, what is the
mass after 63 hours?
a. 0.1625 mg
b. 0.040625 mg
c. 5.2 mg
d. 1.3 mg

What is the celsius temperature that is equal to 94 degrees fahrenheit using the formula f=9/5 c+32

Ihonestly have no clue if it's each or none.

Adeli owner keeps track of the to-go orders each day. the results from last saturday are shown in the given two-way frequency table. saturday's to-go deli orders in person by phone online total pick up 38 25 31 94 delivery 35 28 34 97 total 73 53 65 191 what percent of the to-go orders were delivery orders placed by phone? a. 14.66% b. 38.41% c. 28.87% d. 52.83%