Answer:
7/√2 cm
Step-by-step explanation:
Area of circle = 77 cm^2
=> π(r)^2 = 77
=> (22/7) x (r)^2 = 77
=> (r)^2 = (77 x 7) / 22
=> (r)^2 = 49/2
=> (r) = 7/√2 cm
Answer:
A) x<-1
Step-by-step explanation:
As the circle is not filled in, we know that the inequality must be > or <.
As the line is to the left of -1 (or lower than it). We know that x must be less than -1
Speed is expressed as the ratio of distance/time = d/t
in Alex's case, speed = (3.8 miles / 18 minutes)
. . . or simply
3.8/18
The half-life of the radioactive substance is 67.95 hours.
