Answer:
50.27in2
Explanation:
To find the area you do pie x radius squared
Answer: [B]: Two (2) real solutions .
__________________________________________________________
Explanation:
__________________________________________________________
Given: -7x² − 11x − 2 = 0 ;
__________________________________________________________
We see that it is in "quadratic format" ; that is:
__________________________________________________________
" ax² + bx + c = 0 ; a ≠ 0 ; "
__________________________________________________________
Multiply the entire equation by "-1" ; to get rid of the "negative number" :
__________________________________________________________
→ -1 * {-7x² − 11x − 2 = 0} ;
__________________________________________________________
to get: → 7x² + 11x + 2 = 0 ;
__________________________________________________________
This expression is written in the "quadratic format";
ax² + bx + c = 0 ; in which: a = 7 ; b = 11; c = 2 ;
__________________________________________________________
The expression cannot be "factored"; so, we can solve for "x" ; by using the "quadratic equation formula" ;
__________________________________________________________
x = {-b ± √(b² − 4ac)} / {2a} ;
______________________________________
Let us solve for: "(2a)" : 2a = 2 * a = 2 * 7 = 14 ;
Let us solve for: "(b² − 4ac)": 11² − 4*7*2 = 121 − 56 = 65;
→ √(b² − 4ac) = √65
______________________________________
→ " -b" = -11 ;
________________________________________________
So, x = (-11 ± √65) / 14 ;
________________________________________________
There are TWO (2) solutions:
_______________________________________________________
Solution 1) x = (-11 + √65) / 14 = - 0.2098387322643893071; AND:
_______________________________________________________
Solution 2) x = (-11 − √65) / 14 = -1.3615898391641821214 ;
_______________________________________________________
So, there are TWO (2) real solutions.
_______________________________________________________
S = 899
s = 3w - 66
3w - 66 = 899
3w = 899 + 66
3w = 965
w = 965/3
w = 321.67 <==
Step-by-step explanation:
charging the phone for 1 minute ,it has 2%
i.e,1----->2
After 2 minutes from that time ,i.e total 3 minutes
it has 6% charge
i.e,3--------->6
from the both the above cases ,1 minute provide 2%=6/3
=2
Hence,
for getting 50%charge=50/2
=25 min
and,for 90 %charge=90\2
=45 min
