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

By 7:00PM, 1/3 of the junior class had arrived at a school dance. By 8:00PM, 30 more juniors had arrived, raising the attendance to 1/2 of the junior class. How many people are in the junior class? a. 30 b. 90 c. 120 d. 180 e. 140

Solve v²-8v-33=0 by factoring

This box can be packed with 48 unit cubes the edge length each unit cube is 1 meter what is the voume of the box

A sequence is defined by the recursive function f (n + 1) = 1/3f (n). If f (3) = 9, what is f (1) a) 1 b) 3 c) 27 d) 81

Kim is x years old. jordan is 7 year older than kim. four times jordans age is equal to 200 (A) write an equation that could be used to solve for kims age x

What is the answer to 3n + 3 = 27

The mean of 3 consecutive terms in an arithmetic sequence is 10, and the mean of their squares is 394. What is the largest of the 3 terms?

A race at travels at a rate of 205 mph how far would it travel in 3 hours?

What is 8/20 of an hour

An actor invests some money at 9 % simple interest, and $24,000 more than three times the amount at 10 % simple interest. The total annual interest earned from the investment is $38,670. How much did he invest at each amount? Use the six-step method.