Answer:
it is the fourth one it is your answer
Answer:
The sprinter
Step-by-step explanation:
Change cyclist to same units as sprinter (m/s)
20 km = 20x1000 m = 20000 m
1 hour = 60 minutes = 60 x 60 = 3600 sec
So 20 km/hr = 20,000 m / 3600 sec = 5.6 m/s
The sprinter is faster as he travels at 8 m/s.
(Similarly if you change the sprinter's speed into km/hr
you should get 28.8 km/hr)
Answer:
B
Step-by-step explanation:
Seeing as the change is consistent within the vertices, this would be correct.
A is the correct answer. 23/40=0.575 and 4.6/8= 0.575 as well.
Answer:
x = -2 + √7 and x = -2 - √7
Step-by-step explanation:
To ease the solution of this problem, rewrite it in standard quadratic form:
x^2 + 4x - 3 = 0.
One way to solve this is by completing the square. We take 4 (the coefficient of x), halve that, obtaining 2, and then square the result, obtaining 4.
Add 4 to x^2 + 4x, and then subtract 4:
x^2 + 4x + 4 - 4 - 3 = 0, or (x + 2)^2 = 7
Taking the sqrt of both sides, we get x + 2 = plus or minus √7.
The solutions are thus x = -2 + √7 and x = -2 - √7.