I think the answer would be D
Yes, 90 is 1/10 of 900
Because
90 = 1/10 x 900
90 = 90
Recall the secant-tangent theorem, and you have
EA^2 = EC*CD
12^2 = 8*(x+10)
and now ED = EC+CD = 8+x+10
I suspect a typo somewhere in the murk above
Answer:
The groups walking speed is
or 
Step-by-step explanation:
we know that
To find the speed divide the distance by the time
so

Convert to mixed number

There are 36 inches in a yard. 36*6.75 =243. 6.75 yards is the same as 243 inches.