A computer that costs x dollars wholesale is marked up 20% at a store. Which expression represents the final price of the computer?
A. x + 0.20
B. 1+0.20x
C. (1 + 0.20) x
D. (1 + x) 0.20

Customers at an ice-cream shop took a survey .the results showed that 144 customers rated the shop as being "very satisfactory ."this number represented 45%of the total nunber of customers who took the survey

The size of a certain cell is 2.5*10^-9m. another cell is 1.5*10^3 times larger. how large is the larger cell in scientific notation?

Hurry if the population of of an ant hill doubles every 10 days and there are currently 100 ants living in the ant hill what will the ant population be in 20 days