The half-life of a radioactive kind of

cesium is 30 years. How much will be

left after 60 years, if you start with

1,800 grams of it?

Divide and round to the nearest hundredths place. 0.82 : 9

Solve the equation 3 (-a-3) - 2 (3a+3) = -78

Find the percent of the change from 145 to 85

If A and B are 6x5 matrices, and C is a 8 x 6 matrix, which of the following are defined? A. CT B. AC C. B+C D. A+B E. ABT F. CA

How do you calculate the area of a triangle using trigonometry?

Mrs. Barlow's math class took a test yesterday. Out of 80 students, 70% of them passed. How many of Mrs. Barlow's students passed the test?

What's the result of: (2/3) ³

Airline fares for a flight from Dallas to Austin are $30 for first class and $25 for the tourist class. If a fight had 52 passengers who paid a total of $1360, how many first class passengers were on the trip?

You have a recipe that requires 1/3 cup of sugar, but you only want to make a fourth of the recipe. How much sugar do you need to make this fraction of the recipe?

I just need clarification. If a rectangular prism has the dimensions of 10 by 4 by 6, The volume would be 240 in³ and the surface area would be 248 in² right?