A company wants to purchase two types of lightbulbs, CFL (compact fluorescent) and LED (light emitting diode). The cost of each CFL bulb is $2, and the cost of each LED bulb is $20. The company must purchase a total of 800 lightbulbs, must spend at most $5,000 on the lightbulbs, and wants to purchase as many LED bulbs as possible. Let L represent the number of LED lightbulbs purchased, and C represent the number of CFL lightbulbs purchased. Which of the following systems models the situation described?

its 4 because 2 times 2 is 4, if you double the number two you get four

the correct answer is d

hope this

answer

d. 10

explanation

the distance from point y to wx is the height of the triangle.

using pythagoras theorem,

group similar terms to get,

this implies that,

take positive square root of both sides to get,

this implies that,

δabc ≅ δdcb by sas because

db ≅ ac . . given (side)

bc ≅ bc . . reflexive property (side)

∠dbc ≅ ∠ acb . . alternate interior angles where transversal bc crosses parallel lines bd and ac (included angle)