What percent of 25 is 12

The half-life of a radioactive isotope is the time it takes for a quantity of the isotope to be reduced to half its initial mass. starting with 145 grams of a radioactive isotope, how much will be left after 5 half-lives?

Numbers between 2 and 2 1/2

How do you factor 18p minus 22

Suzy has a collection of quarters and dimes. Together she has 44 coins worth $6.95. How many quarters and how many dimes does Suzy have?

Jacques and Aaron both started this year at 5.65 feet tall. Jacques has grown 0.2 feet since then. Aaron has grown twice that amount. How tall is Aaron?

What is the area of a circle with a circumference of 37.68

Suppose U={0, 1, 2, 3, 4, 5, 6}, A={2, 4, 6}, and B={1, 2, 3}. Tell whether each statement is true or false. subset U true false subsetC true false

How much pure fruit juice needs to be added to 14gal of 35% fruit juice to make a mixture that contains 50% of the fruit juice? Use the table to solve this mixture problem.

Find the exact value of sin (pi/3 + pi)

What is the general formula for an parallelogram