A radioactive substance decays exponentially. A scientist begins with 100 milligrams of a radioactive substance. After 27 hours, 50 mg of the substance remains. How many milligrams will remain after 36 hours?

If 3 is added to a certain number, the results is 15 less than three times the number. Find the number

What graph would y^2-4x-2y-2 be? A circle, ellipse, parabola, or hyperbola?

Solve (x - 3) = 5 Give your solutions correct to 3 significant figures.

Venera sent a chain letter to her friends, asking them to forward the letter to more friends. The relationship between the elapsed time t, in months, since Venera sent the letter, and the number of people, P (t), who receive the email is modeled by

What is the relationship of the 8's in the number 8,800

18.4 + 8w = 6 (9w - 4.6)

What is a bird favorite type math

You design a tree house using a coordinate plane in which the coordinates are measured in feet. The vertices of the floor are (-2,-3), (-2,4), (5,4) and (5,-3). Find the perimeter (in yards) and the area (in square yards).

Which table represents a direct variation function? Input (x) 2 3 4 5 6 Output (y) 7 8 9 10 11 Input (x) 2 4 6 8 10 Output (y) -3 -5 -6 -7 -8 Input (x) -5 -4 -3 -2 -1 Output (y) 10 8 6 4 2 Input (x) -2 1 0 1 2 Output (y) -3 -3 -3 -3 -3

A certain population of bacteria has an average growth rate of 2%. The formula for the growth of the bacteria's population is A=P0?1.02t, where P0 is the original population and t is the time in hours.