The ocean covers 71% of the earth's surface. if the total surface area of the earth is about 510 million square kilometers, how many square kilometers are covered by the ocean?

answer: sorry i can't you.

step-by-step explanation:

  or  

step-by-step explanation:

if the four friends split the cost, p, of the pizza evenly, then each friend pays one-fourth of the cost of the pizza.

the expression is   or  

cross multiplying, we get :

⇒ (3) × (5) = (9) × (x)

⇒ 15 = 9x

b. is true. hope this . happy