Someone help plz and thanks

Fractions can be added and subtracted only if they're fractions. a. like b. proper c. improper d. unlike

What is the definition of exponential decay?

11. a particular type of cell doubles in number every hour. which function can be used to find the number of cells present at the end of h hours if there are initially 4 of these cells? a. n = 4 ()" b. n = 4(2)" c. n = 4 + (2)" din = 4 +"