The answer is sixty!
4(5+10)
4(15)
60
Given that the half life of carbon-14 is 5,715 and that 6 g of the isotope is remaining after 1,000 years, the initial quantity of the isotope is obtained as follows:
Recall that the amount remaining of a radioactive substance with initial quantity No and half life t(1/2) after t years is given by:

Thus:
60 miles per hour
distance=rate times time
first part
rate=60mph
time=3h
distance=60mph times 3h=180 miles
part 2
time=2 hours
rate=70mph
distance=70mph times 2h=140miles
total is 180mi+140mi=320miles
Answer:
Write in y=mx+b, or slope intercept form.
y represents the total cost of the function hall.
x represents the number of guests.
y=250+15x
B ( i think )
i might be wrong though