3. a ladder that is 20 feet long is leaning against the side of a building. if the angle formed between the ladder and the ground is 75 degrees, how far is the bottom of the ladder from the base of the building?

you probably already have the answer but anyways it's b. 15.0

step-by-step explanation:

solution:

the given function is ,

      =

the three roots of this quadratic function is , 0 ,8 and 10.all the roots are real and rational.

if a quadratic equation is of the form ,

sum of the roots = a + b +c= 0+8+10=18=  

product of roots taken two at a time = a b + b c+ c a = 0+80+0=80 =  

product of roots = a b c = 0=  

there are 11 doors in a hall starting from 0 to 11.the entry in the hall is permitted through gate number 0 and exit is allowed through only gate number 8 and 10.so, three roots(0,8,10) of quadratic function is given by entry and exit route of this hall.

the answer is 13

step-by-step explanation:

5*5=25

12*12=144

25+144=169

169^2=13