A parabolic mirror to be used in a searchlight measures 40 centimeters tall
and 80 centimeters wide. It's light bulb
needs to be placed at the focus for the light
to magnify properly. Find the distance from
the vertex to the bulb.
Hint: Assume the parabola opens
downward and has its vertex at the origin.
PLEASE HELP

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?

For what values of x is x2 + 2x = 24 true?

Asurvey of 2,000 doctors showed that an average of 3 out of 5 doctors use brand x aspirin.how many doctors use brand x aspirin