A purchasing manager at a university is investigating which brand of LCD projector to purchase to equip "smart" classrooms. of major concern to her is the lifetime of the light bulbs used in the projectors. One company has published the following information regarding the lifetimes of a sample of 50 bulbs used in its LCD projectors: BEN Frequency 20 16 15 12 10 6 5 4 S 700 750 900 950 1000 SOO 850 Bulb lifetime (in hours) Based on the histogram, find the proportion of bulb lifetimes in the sample that are greater than or equal to 900 hours. Write your answer as a decimal, and do not round your answer.​

i believe the answer is d.

hope it you! : d

plz yuo

step-by-step explanation:

c.   x=2.4cm

step-by-step explanation:

similar triangles are triangles which have the same shape but not the same size. this means their angle measures are equal but their side lengths are not instead they are proportional. to solve, we will set up a proportion and solve.

a proportion is two equal ratios set equal to each other. we form the ratios by finding corresponding sides (sides which match to each other on both triangles by their position). out ratios will be one side of the small triangle over the corresponding side on the big triangle as shown below:

.

to solve the proportion, we'll cross multiply by multiplying numerator with denominator across the equal sign.