Convert 0.84 into a simplified fraction

Consider that lines b and c are parallel. what is the value of x? what is the measure of the smaller angle?

Two variables, x and y, vary inversely, and x=12 when y=4. what is the value of y when x=3?

Arestaurant chef made 1 1/2 jars of pasta sauce. each serving of pasta requires 1/2 of a jar of sauce. how many servings of pasta will the chef be able to prepare using the sauce?