Answer:
multiply (x-1) to both sides and then subtract three from both sides
3 = (x-1)(x+1)
3 = (x^2 -1)
0 = x^2 - 4
(x-2)(x+2) = 0
x = 2
x = -2
Step-by-step explanation:
Answer:
C
Step-by-step explanation:
C
Answer:
The equation of a circle:
Step-by-step explanation:
The equation of a circle:
(where the center is known as and the radius, known as ).
-Since you already have the center and the radius, use them for the equation of a circle:
Center:
Radius:
After you have the equation of a circle, simplify the radius by the exponent :
So, you have found the equation of a circle.
Answer:
20,365.7 seconds
Step-by-step explanation:
First, we need to know how to convert yards to miles, as the question is in miles. We know that 1 mile is equivalent to 1760 yards. So we have:
1 mi = 1760 yards
If we multiply both sides by 81:
81 mi = 142,560 yards
And we know that the sprinter needs 8 second to run 56 yards:
8 s = 56 yards
If we divide both sides by 56 we get the time he needs for 1 yard:
8/56 s = 56/56 yards
1/7 s = 1 yard
So, takes him 1/7 seconds to run one yard. At this rate he runs 142,560 yards in:
(1/7) * 142,560 = 20,365.7
So, he needs 20,365.7 seconds to run 81 miles (142,560 yards)
The answer is A because 2+1 equals 3 m+m equals 2m