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Step-by-step explanation:

if the text is correct, I see

0.16 × 0.7 / 0.4

that is the same as

16/100 × 7/10 / 4/10 = 16/100 × 70/100 / 40/100 =

= 16/100 × 70/100 × 100/40 =

= 16/100 × 70/40 = 16/100 × 7/4 =

= 4/100 × 7 = 28/100 = 0.28

5

step-by-step explanation:

the answer is b: 18

step-by-step explanation:

use the pythagorean theorem to .

a^2+b^2=c^2

plug 18 for "r"

the 2 legs are 18 and 24

18^2+24^2=c^2

324+576=c^2

900=c^2

c=30

30-12=18

18 is the radius

: )