1. The area of a rectangle is 20, and its diagonal is√104. Find its dimensions and perimeter. Long side:
Shorter side:
Perimeter:

2. A coin, thrown upward at time t=0 from an office in the Empire State Building, has height in feet above the ground t seconds later given by

h(t)=−16t^2+112t+288=−16(t−9)(t+2).

a) From what height is the coin thrown? Include units in your answer.
b) At what time does the coin hit the ground? Include units in your answer.

answer: .64

step-by-step explanation

set up the formula for standard deviation for this set of numbers, then simplify

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.

5/20 so 25%

step-by-step explanation: