8.065 is how much each adult payed
see u first need to check which is the most close the given value now you need to choose middle value and hence the margin will be the difference divided by two with a plus and minus sign.
over here its 26.5-22.4=4.1
now dividing by 2 we get 2.05
hence the margin error is ± 2.05
now add this to 1st number or subtract from the second no. and hence thats the no. from which the no. is deviated 22.4 ± 2.05
29.99 * .20= 5.998
29.99- 5.998 = she payed 23.99
25* .10= 2.50
25-2.50= he payed 22.50
therefore he got the better deal
x= (-3+3i ) /2 or x=( -3-3i) / 4
given equation is:
ax²+bx+c=0 is general quadratic equation.
x= (-b±√b²-4ac) / 2a is quadratic formula to find the value of x.
comparing given equation with quadratic formula,we get
a= 2 ,b= 6 and c= 9
putting above value in quadratic formula,we get
x= (-6±√6²-4(2)(9)) / 2(2)
x= (-6±√36-72) / 4
x = (-6±√-36) / 4
x= (-6±√-1√36) / 4
x= (-6±6i) /4
x= 2(-3±3i)/ 4
x= (-3+3i) /2 or x= (-3-3i) / 4 is solution of 2x²+6x+9=0.