Apharmacist needs to fill an order for a 3% lidocaine topical cream. however, only 2% and 4% concentrations are in stock. how much of the 4% concentration should be mixed with 30 g of the 2% concentration to get a 3% concentration?

answer:  

step-by-step explanation:

here x represents the height of the pole,

and, the height of the shadow of the pole is 12 feet.

also, the angle of elevation from the top of the pole is 40°,

therefore,

by the low of sine,

which is the required equation for finding the value of x,