Carbon-11 has a half-life of about 20 minutes. If we start with 200 grams, how much will be left after 3 hours?

Will give brainliest what is the value of x? enter your answer in the box.

If the wwight of a package is multiplied by 7/10 the result is 65.8 find the weight of the package

Arley is building a model of a city map. in one part of the city, three roads form a right triangle, which harley draws as triangle abc, with the following measures: m∠b=90° and m∠a=30°. in his scale model, the hypotenuse of triangle abc, ac¯¯¯¯¯¯¯¯, has a length of 817−−√ cm. what is the value of a (the length of bc¯¯¯¯¯¯¯¯)?