Question

Mhanifa please help im almost done :)

Answer 1

19)

• 9/4 = (r - 10)/r
• 9r = 4(r - 10)
• 9r = 4r - 40
• 5r = -40
• r = -8

20)

• (x + 6)/x = 10/7
• 10x = 7(x + 6)
• 10x = 7x + 42
• 3x = 42
• x = 14

21)

• (n - 9)/(n + 5) = 7/4
• 7(n + 5) = 4(n - 9)
• 7n + 35 = 4n - 36
• 3n = -71
• n = -71/3

22)

• 6/(b + 9) = 4/(b + 5)
• 6(b + 5) = 4(b + 9)
• 6b + 30 = 4b + 36
• 2b = 6
• b = 3

23)

• 8/3 = (v - 9)/(7v + 4)
• 8(7v + 4) = 3(v - 9)
• 56v + 32 = 3v - 27
• 53v = - 59
• v = -59/53

24)

• 8/(5x - 4) = 6/(x + 5)
• 8(x + 5) = 6(5x - 4)
• 8x + 40 = 30x - 24
• 22x = 64
• x = 64/22
• x = 32/11