Answer:
18.84
Step-by-step explanation:
The formula for circumference is 2(pi)r, I think. The radius is 3. 3 times 2 is 6. 6 times 3.14 is around 18, I think.
It should be 146 square cm.
First, you would start off by finding the areas of the trapezoid.
Formula- h (base+base 2) 1/2= Area
Formula- (4+14) 10 1/2
Formula- 18 x 10 1/2
Formula- 180 1/2
Area- 90 squared cm
Next, we have to find the area of the triangle. This one is a little more tricky because the height is not given. I believe it goes like this-
Formula- bh 1/2
Formula- 14 x 8 1/2 (The reason I chose 8 is because 10 is the height for the first one so 18-10=8)
Formula- 14x4
Area- 56 square cm
Let wind speed = x mph
when she rode 2 miles against the wind we have:-
speed = distance / time so
20 - x = 2 / t -------(1) where t is the time she took.
when riding with the wind we have
20 + x = 3 / t--------(2) adding equations (1) and (2):-
40 = 2/t + 3/t
40 = 5/t
t = 5/40 = 1/8 hr
x = 20 - 2 / 1/8 = 20 - 16 = 4
Wind speed was 4 mph Answer
X = -1 and -1.5 so the 4th answer