A radioactive substance decays exponentially. A scientist begins with 160 milligrams of a radioactive substance. After 31 hours, 80 mg of the substance remains. How many milligrams will remain after 58 hours?

In the triangles, bc =de and ac fe. if the mzc is greater than the mze, then ab isdfelth

1. 2. ∠b and ∠y are right angles. 3.? 4.? which two statements are missing in steps 3 and 4? ∠x ≅ ∠c △abc ~ △zyx by the sas similarity theorem. ∠b ≅ ∠y △abc ~ △zyx by the sas similarity theorem. = 2 △abc ~ △zyx by the sss similarity theorem. = 2 △abc ~ △zyx by the sss similarity theorem.

Sally deposited money into a savings account paying 4% simple interest per year. the first year, she earn $75 in interest. how much interest will she earn during the following year?