Let the expression a ⊥ b be defined:

a ⊥ b = 5ab2

Evaluate: - 10 ⊥ - 10

A) - 50000

B) - 5000

C) 500

D) 5000

E) 50000

A bookshelf contains 9 mysteries, 7 biographies, and 4 science fiction books. A book is randomly selected, not replaced, then another is selected. Find the probability of selecting a biography then a mystery.

What is the best method to solve the system of equations? 2x + 3y = 8 4x - 6y = 2?

Solve the quadratic equation by completing the square. x^2 + 4x - 9=0 first, choose the appropriate form and fill in the blanks with the correct numbers. then, solve the equation. if there is more than one solution, separate them with commas.

What is the answer to 12x+6=18-48-9x

Multiplying fractions: 5 1 - x - = 6 2

A one month supply of multi-vitamins is $28. A two month supply is $49. How much money can a customer save by going with a two month supply?

What is the best classification of - 4/5 in the real number system?

What are the x and Y intercepts of Y=x^2+3x-10

Ind each number. round to the nearest tenth if necessary. 25.5% of what number is 153?

Identify the number of solution or zeros. x^5 - 5x^2 + 6 = 0