Simplify
-3(2.5-k)+0.5(7+8k)

Afarm that has 4 x 10^2 acres has 1.2 x 10^5 cattle. what is the average number of cattle per acre? write the answer in scientific notation. answere asap

The cost of using a service is $0.25 per min. what equation correctly represents the total cost c, in dollars, for d days of use?

How many times larger is 6 × 10^12 than 2 × 10^7? a. 30,000 b. 3,000 c. 3,000,000 d. 300,000