Carl wants to find the product 30×56. Which of the following best explains how he can find the product mentally?
A.

He knows that 30÷5 is 6. He then multiplies 6 by 6 to get 36.
B.

He knows that 30×66is 30. He then subtracts 1 from 30 to get 29.
C.

He knows that 3×6=18. He then adds 18 and 5 to get 23.
D.

He knows that 30×16is 5. He then multiplies 5 by 5 to get 25.

Sara made $253 for 11 hours of work. at the same rate how much would he make for 7 hours of work?

Solve for x and select the correct answer

Which of the following statements is true? a. the irrational number system is not closed under multiplication, because the product of two irrational numbers is always a rational number. b. the irrational number system is not closed under multiplication, because the product of two irrational numbers is not always an irrational number. c. the irrational number system is closed under multiplication, because the product of two irrational numbers is always an irrational number. d. the irrational number system is closed under multiplication, because the product of two irrational numbers is always a rational numbers. reset submit