a scientist has grams of a radioactive substance. write an expression that shows the amount of the substance that remains after one half life.

Distance between Train 1 and Train 2 = 95 miles. Average speed of Train 1 = 45 mph. Average speed of Train 2 = 60 mph. Train 1 is ahead of Train 2 on the same track. How long before Train 2 would overtake Train 1 if neither train is re-routed?

In 2012, the population of a city was 6.81 million. the exponential growth rate was 1.61 % per year. a) find the exponential growth function. b) estimate the population of the city in 2018.

How heavy is 24 carat gold?

Solve for y. 6 (y+4) = -3 (2y-2) + 8y Simplify your answer as much as possible. y =

Using grouping, factor 2 a2 - 13a + 21. You must show your work to receive credit! y = (2a + 7) (a + 3) y = (2a + 7) (a - 3) y = (2a - 7) (a + 3)

What do you add to 3 and 4/7 to make 6?

What are the next three terms of the pattern 4, - 2, - 8, - 14, ... ?

Ifx + 2y = 8 and - 2x + 3y = 5, then what is the value of 2x + 3y?

Caden built a rectangular prism that has a length of 8 units a width of 3 units, and a height of 5 units. what is the volume of the prism. show your work

3x-5y = - 25 Solve for x