4^2 = 16 added to 11 = 27 times 7 = 189
log (10) = 1
Add both equations together results in : 25 y = 0 so y = 0
Substitute y= 0 into one of the equations results in x= 8
Using the decimal digits 0-9
If a digit is used in the first position there are only 9 choices for the second digit....then 8 for the third then 7 for the fourth
so 10 x 9 x 8 x 7 = 5040
as opposed to 10000 if you can use a digit more than once.
The TWO ends = TWO x pi r^2 = 2 * pi * 5^2 = 50 pi
The outside = pi * d * h = pi *10 *15 = 150 pi
Total surface area (add them up) 150 pi + 50 pi = 200 pi = 628.32 sq in
4x+5y=6
4x=6-5y
x=(6-5y)/4
Substitute this 'x' into the SECOND equation
6 (6-5y)/4 - 7y = -20
(36-30y)/4 - 7y = -20
36-30y -28y = -80
-58y = -116
y = 2
x=(6-5y)/4 = (6-10)/4 = -1
You are describing this:
2(6+2x) =(x)(-6) + 2 Solve for 'x' = -1
-1 +- .866 i
QUADRATICS are parabolas.
Generally the equation will look ike y = ax^2 + bx + c OR y= a(x-h)^2 + k
