Question

1. if A:B =1:2,B:C=2:3, find A:C
2.simplify (0.7)² - (0.5)²​

Answer 1

Answer:

1- 1:3

2- 0.24

Step-by-step explanation:

A:B=1:2

B:C=2:3

we know A/B=1/2

∴ B = 2A

b/c=2/3

but b=2a

∴ 2a/c=2/3

a/c=1/3

∴  A:C = 1:3

2)

(0.7)² - (0.5)²

a²-b² = ( a + b )*( a - b )

∴ (0.7)² - (0.5)² = ( 0.7 + 0.5 )*( 0.7 - 0.5 )

= ( 1.2 )*( 0.2 )

= 2.4