This exercise uses the radioactive decay model. Radium-221 has a half-life of 30 sec. How long will it take for 78% of a sample to decay? (Round your answer to the nearest whole number.)

Graph the equation. select integers for x

You have 17 cats that live in houses on your street, 24 dogs, 3 fish, and 4 hamsters. what percent of animals on your block are dogs?

Prove the divisibility of the following numbers: 25^9 + 5^7 is divisible by 30.also, read as (25 to the power of 9) + (5 to the power of 7) is divisible by 30. blank x 30what is the blank? ( it should be expressed in exponent form)