The half-life of a radioactive substance is 50 years. if you start with some amount of this substance, what fraction will remain in
50 years? what fraction will remain in 100 years?
the fraction that will remain in in 50 years is the following.
|
(simplify your answer.)
the fraction that will remain in in 100 years is the following.
(simplify your answer.)

The cost of using a service is $0.25 per min. what equation correctly represents the total cost c, in dollars, for d days of use?

Which is the scale factor proportion for the enlargement shown?

Grace is standing 18 feet from a lighthouse and kelly is standing 10 feet from grace. the angle that grace looks up to see the top of the lighthouse is 45°. the angle that kelly looks up to see the top of the lighthouse is y°. find the height, h, of the lighthouse. find the angle, rounded to the nearest tenth of a degree, in which kelly looks up to the top of the lighthouse. to the nearest tenth of a degree, find the value of x° . in two or more sentences, explain your calculations