Radium-226, a common isotope of radium, has a half-life of 1,620 years. How many grams of a 120-gram sample will remain after t years?

7. 81,46,73,32, 54,81, 20, 41 Median

Two forest service watchtowers spot a fire in the distance. The fire is 27 miles from Tower 2. About how far apart are the two watchtowers?

Evaluate - 3.25 - 2.75z for z = - 4.

Jerry's softball team is made up of 23 players, and 11 of them are boys. on the team, what is the ratio of girls to boys?

You get paid £10 per hour. You work 7 hours a day. You work 5 days a week. How much is your total pay each week?

How many permutations of {1, 2, 3, 4, 5, 6} exist such that: (a) No even integer is in its natural position. (b) Exactly three integers are in their natural position. (c) 1 and 6 are in their natural positions.

Use the formula F=1.8C+32 to convert - 20° into fahrenheit.

Solve in the correct order: (-3 - 4) / - 9 A) - 7/-9 B) - 7/9 C) 7/9 D) - 1/9

Suppose a lab needs to make 400 liters of a 39% acid solution, but the only solutions available to the lab are 20% acid and 50% acid.

If the price is $40, the number of units sold is 450, and the average cost is $33, what is the profit?