The half-life of Uranium-238 is 4.5 billion years. A 100 gram sample of the Uranium-238 sits in a cave, untouched, for 9 billion years. How much of the sample is left.

answer:   28.56 feet (approx)

step-by-step explanation:

since, triangle abc has measure of angle c equal to 55 degrees, measure of angle abc equal to 90 degrees, and length of bc equal to 20 feet.

we have to find out the measurement of segment ab.

therefore, tan 55° =

but bc = 20 feet.

⇒ tan 55 ° =  

⇒ ab = 20 × tan 55 °

⇒ ab = 20 × 1.42814800674

⇒ ab = 28.5629601348   ≈ 28.56 feet

the real question is why is this guys last name heavyfoot

step-by-step explanation:

d. you cannot tell because there are no values shown.