Tom makes a scale drawing of a statue using the scale 1 cm: 5 ft. His drawing measures 16 cm. Mary makes a scale drawing of the same statue, but uses the scale 1 cm: 4 ft. How many centimeters tall is the statue on Mary's drawing?

20 cm

Step-by-step explanation:

1 cm of Tom's drawing is 5 ft of the statue

So his 16 cm drawing is

1 cm of Mary's drawing is 4 ft of the statue

1 ft of the statue is of the drawing.

So, 80 feet of the statue is of the drawing.

Hence, Mary's drawing is 20 cm tall.

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)