Gunther needs a 75% concentrated solution. When making his solution at room temperature, he could only make a solution that was 70% before the solute settled out.

What could he do to make his solution reach 75%?

Put the solution in an ice bath, dissolve the solute, and let it return to room temperature.

Heat the solution, dissolve the solute, and let it cool verifying nothing settled out.

Add more water, boil the solution, and dissolve the solute until the some of the water evaporates.

Keep the solution at room temperature, add more water, and dissolve the excess solute.

In a laboratory, nakisha mixes sodium hydroxide solution with an indicator called phenolphthalein. when combined, they create a pink solution. nakisha wonders if mixing other solutions with phenolphthalein will also create this pink color. how could she use the scientific inquiry process to explore it further?

Choose the most likely outcome of this scenario: jen decided to go bike riding without a helmet. while no one is around during her ride, she is thrown from her bike when her wheel goes into a pothole. she is not injured, but she is terrified to get back on her bike. what happens next? a. her physical health is affected even though she wasn't hurt. b. her mental and emotional health are affected because she is afraid to get back on her bike. c. her social health is affected because she is worried her friends saw the fall. d. her overall health is not affected at all by her fall.

The number of passengers who arrive at the platform of a subway station for the 10 am train is a random variable with a mean of 120 and a variance of 16. find the lower bound of the probability that there will be between 100 and 140 passengers (round off to second decimal place).