Answer:
The answer is A.
Step-by-step explanation:
You can make a test by substituing x-coordinate into the equation :
Circumference of a circle
C = 2πr
since r = 14 then
C = 2π14
C =28π.
Area of a circle
A = πr²
A = π14²
A = 196π
The derivative of constant numbers is zero.
If two lines are crossed by another line that is called the transversal, the corresponding angles those in matching corners. In this problem, we have two parallel lines:
In this way, x° and 76° are corresponding, therefore:
(x)° = 76°
∴ x = 76
Answer:
45, 36
Step-by-step explanation:
let x y minutes be the time for pipes to fill the tank, let n be the water needed to fill the tank.
x-y=9
(n/x)*20+(n/y)*20=n
n is removed by dividing the 2nd equation by n
here u get:
(1/x+1/y)*20=1
you sub x=9+y into the above equation
1/y+1/(9+y)=1/20
((9+y)+(y))*20=(9+y)(y)
180+40y=9y+y2
y2-31y-180=0
then use the quadratic formula and u will find y=36 or -5
-5 is rejected because it is negative
x=36+9=45
therefore it is 36 mins and 45 mins
