how many c. c of water must be evaporated from 200 c. c of a 8% salt solution to form a 12% salt solution?

0if x and y vary inversely and y=6 as x=7, what is the constant of variation?

Graph the line that represents a proportional relationship between d and t with the property that an increase of 33 units in t corresponds to an increase of 44 units in d. what is the unit rate of change of dd with respect to t? (that is, a change of 11 unit in t will correspond to a change of how many units in d? )

The length of an intercepted arc of a central angle of a circle is 4 cm. if the radius of the circle is 5 cm what is the measurement of the central angle to the nearest whole degree