Triangle efg has angles whose measures are in the ratio 2: 4: 9. what are the measures of the angles

Consider the function f(x)=−2/3x+5 . what is f(1/2) ? enter your answer, as a simplified fraction, in the box. f(1/2)=

Find the domain of the following expression: 1/(√x)-2

The? half-life of a radioactive substance is 20 years. if you start with some amount of this? substance, what fraction will remain in 120 ? years