Solve for the value of r: 0.3r=2.1
A.0.7
B.21
C.3
D.7

Joseph haydn pet store offers wide variety of leashes for dogs. the store purchases one popular type of leash from its manufacturer for $4.38 each. joseph haydn pets marks up leashes at a rate of 238% of cost. what is the retail price of the popular leash?

The sum of the squares of two numbers is 8 . the product of the two numbers is 4. find the numbers.

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