The angle of elevation from a person on the boat looking up to the lighthouse is _ degrees. If the lighthouse is 25 meters tall, the boat is _
meters away from the base of the lighthouse.

Achemist has 200 ml of a 10% sucrose solution. she adds x ml of a 40% sucrose solution. the percent concentration, y, of the final mixture is given by the rational function: the chemist needs the concentration of the final mixture to be 30%. how many milliliters of the 40% solution should she add to the 10% solution to get this concentration?

Can you me find the missing length. i attached an image.

Factor and solve to find roots x squared -x - 90 =0