A scientist begins with 100 mg of a radioactive substance. After 6 days, it has decayed to 60 mg. How long after the process began will it take to decay to 10 mg?

A pentagon has exterior angle measures of 5a, 4a, 10a, 3a, 8a. find the value of a.

Harlan has 1200 u. s. dollars. if 1 canadian dollar equals 0.9391 u. s. dollars, about how many canadian dollars can harlan buy for his u. s. dollars?

A pound of chocolate costs 7 dollars. Tiffany buys p pounds. Write the equation to represent the total cost c that Tiffany pays.

Natasha spent 1 1/2 hours on the beach. She fell asleep for 3/4 of the time she was on the beach and then woke up with a terrible sunburn. How many hours was Natasha asleep on the beach?

Every day, Jason runs for 32 minutes and lifts weights for 44 minutes. How many minutes will Jason spend working out in 9 days? A. 108 B. 396 C. 684 D. 85

Hourses a clydesdale drinks about 120 gallons of water every 4 days at this rate, about how many gallons if water dies the clydesdale drink in 28 days?

Jessica is printing invitations to a graduation party. She needs to print 250 invitations one per sheet of paper. She was only able to purchase 5 packages of 25 sheets of paper at the store.

Jacob painted 30% of a banner. luis painted an equal amount of the same banner. the rest of the banner remains unpainted. write a fraction to describe the amount of banner that remains unpainted?

What is the answer for -4^2 (negative 4 with exponent of 2) and (-4) ^2 (in parentheses negative 4, then when parenthesis close, it says exponent of 2)

If I have 25 marbles and I have to divide them for 25 people how much will that be