1. a survey with 30 students revealed that 10 would like to visit hawaii, 12 would like to go to las vegas, and 5 would like to go to hawaii and las vegas. how many students do not want to go to neither of hawaii nor las vegas?

Amerchant has coffee worth $60 a pound that she wishes to mix with 50 pounds of coffee worth $90 a pound to get a mixture that she will sell for $70 a pound. how many pounds of the & 60 coffee should be used?

Afactory adds 3 red drops and 2 blue drops of coloring to white paint to make each pint of purple paint. the factory will make 50 gallons of the purple paint. how many drops of red and blue coloring will the factory need in the 50 gallon batch of purple paint.

Prove that quadrilateral is a rhombus.