Answer:
125 min
Step-by-step explanation:
given :
4 words -----> takes 1 min
1 word --------> takes 1/4 min
500 words ------> takes (1/4) x 500 = 125 min
SA=4pir^2
78.54km^2=SA
78.54=4pir^2
divide both sides by 4
19.635=pir^2
aprox pi=3.14 so divide both sides by 3.14
6.25318=r^2
sqrt both sides
2.50063=r
round
radius=2.5km
this question is flawed in that it gives the wrong units
answer is the option with 2.5 in it
2nd one
First, note that

is always positive (except for x=0), so

must be always negative.
Thus, the only plausible graphs are 1 and 3 since they are below the x-axis.
Now,

and

are only defined for x≥0, because only for these x'es we can take the square root.
Note that the third graph has domain (-infinity, 0], so it is not the right one, while 1 is ok.
Answer: first graph
Find the commomon denominator of 6 and 5.
It's 6 · 5 = 30.


Divide by fraction is the same like multiply by reciprocal of this fraction:
