Distribution, CLT and Substitution Name Date

Simplify each expression. Copy original problems and show all work for all steps on separate paper. REMEMBER TO SUBSTITUTE LAST (The answers are provided so that you know
whether or not you are doing the problems correctly)
1) 5(10 + 6r) - 9 , r = 2
(Solution: 101)

2) -2 - (-9 p - 11) , p = - 3
(Solution: - 18)

3) -7(x + 4) - 11x , x = 8
(Solution: - 172)

4) -5(10 - 8n) - 9(1 - n) , n = -6
(Solution: - 353)

5) 10(7v - 8) - (v - 7) , v = 1
(Solution: - 4)

6) 6(-2 - 4a) - 9(2a + 6) , a = -7
(Solution: 228)

The areas of two similar triangles are 72dm2 and 50dm2. the sum of their perimeters is 226dm. what is the perimeter of each of these triangles?

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

Ireally don't understand this, i'm really an idiot but i want to know how to figure this out. !