Can anyone me with this question? : a target consists of two concentric circles. the larger circle has diameter 1m. when a complete novice fires at the target, the probability of hitting the blue circle is the same as the probability of hitting the green region. find the diameter of the blue circle.

We know that
if  the probability of hitting the blue circle is the same as the probability of hitting the green region
then 
the area of the blue circle is equal to the area of the green region

Let
x> diameter of the blue circle

area of the blue circle=pi*(x/2)²> (pi/4)*x² m²> equation 1

area of the green region=area of the larger circle-area of the blue circle
area of the green region=pi*(1/2)²-(pi/4)*x²
=(pi/4)-(pi/4)*x² m²> equation 2

equate equation 1 and equation 2
(pi/4)*x²=(pi/4)-(pi/4)*x² > divide by (pi/4)---> x²=1-x²
2x²=1> x²=1/2> x=1/√2> x=√2/2 m

the diameter of the blue circle is √2/2 m

At a constant it will take one hour to travel 32 mi.at that speed it will take 1/2 hr to travel the remaining 16 mi.it will take 1+1/2 hr to travel the 48mi @ 32mph.so 1 hr = 60 min& 1/2 hr = 30 min1+1/2 hr = 90 min.there are 60s in each 90 × 60 = 3600 seconds.the real question seriously is he why are they driving so slow? ! lol.

Answer: the correct answer is 10step-by-step explanation: let the number be n, then the expression becomes,then“twelve more than the quotient of a number and two, decreased by four” iswhen n=4,we substitute 4 whetever we see n to get,we simplify to obtain,we further simplify to get,therefore the correct answer is c.