Carbon has a half life of 5730 years. How much carbon would be left after 3 half life's with 56 grams

b. x- 48 =120

step-by-step explanation:

14

step-by-step explanation:

14 x 3 = 42

b. 1.25 hr

step-by-step explanation:

if you have a constant speed of 60 mph, then you have a ratio between 60 mi. to 1 hr. dividing both sides by 60 we get the ratio

1 mi. to

then mult. both sides by 75 we get the ratio

75 mi. to

simplifying we get

75 mi. to

or 1.25 hr.