All numbers that only have one and itself as factors are prime. Therefore, to tell if a number is prime simply find it's factors. If it has more than two factors than it is not a prime number.
The answer is 12.5 because if you add them all together you get 200 and 25 of 200% is 12.5.
Answer:
graphing : Find the intersection points
substitution method : If you have e.g. x+2y=9 and x=3+2y, we can substitute it, (3+2y)+2y=9
elimination method : Make two variables the same, minus them and solve the equation
Step-by-step explanation:
A
120/55 will give you the time it takes him to get there. If you subtract that value from both sides, you'd have:
120/x = # hours left
From there you could easily solve his average speed home.
