A radioactive isotope decays exponentially. The time it takes for half of the amount to decay is called the isotope's half-life. A certain isotope has a half-life of 12 hours. If after 72 hours there are 0.325 mg left, what was the isotope's initial mass? A. 5324.8 mg
B. 20.8 mg
C. 0.289 mg
D 1331.2 mg

Someone this asap for a group of students attends a basketball game. * the group buys x hot dogs at the concession stand for $2 each. * the group buys y drinks at the concession stand for $3 each. the group buys 29 items at the concession stand for a total of $70. how many hot dogs did the group buy?

Askateboard ramp is in the shape of a right triangle what is the height of the ramp

Sara is flying a kite at the park. the angle of elevation from sara to kite in the sky is 53° and the length of the string is 32 feet. of sara is 5 feet tall how far off the ground is the kite