Answer:
They will be 10 miles apart on the 4th hour
Step-by-step explanation:
4hr=60 (15miles)
4hr=48 (12miles)
60
-48
12 more than 10 hours apart
Answer:
you should try adding then subtractung the total to the part
Answer:
The circle has an area of about 1385 square mm.
Step-by-step explanation:
Let's recall that circles have an area that can be found with the following formula:

where r is the radius of the circle.
Now, focus your eyes on the circle. We are shown that the diameter of this circle is 42 mm, but we only want the radius. Since the radius is half the diameter, the radius is 21 mm. Now, we can solve for the area of the circle.

So, to the nearest whole number, the area of the circle is 1385 square mm.
<span>use formula^: a²-b²= (a-b)(a+b)
x²-1=0</span>
x²-1²=0
(x-1)(x+1)=0
x-1=0⇒ x₁=-1
x+1=0 ⇒x₂=1
Answer: x=+-1