Answer:
0.7 seconds
Step-by-step explanation:
You have to subtract both lap times, but before doing so you need to know what 2/5 is in decimal form. To do so, you must do 2 divided by 5, getting 0.4 seconds as it's a fraction converting to decimal. This means Fam swam 29.4 seconds, which instead of 2/5, you have 0.4 as your converted answer, so you would substitute it after 29. Then, you would do 29.40 subtracted by 28.7 and get 0.7 seconds as your answer to find out the difference of their swim times.
X + y = 38
2x + 5y = 100
Where x is how many 2 pointers there were on the test and y how many 5 pinters there were
Elimination method:
2x + 2y = 76
2x + 5y = 100
2x - 2x + 2y - 5y = 76 - 100
-3y = - 24
y = 8
Apply it to the equation to get x
x + 8 = 38
x = 30
30 two pointers
8 five pointers
This is pretty much saying that if x = -3, then solve for the equation, so (-3)^2 - 4(-3) = 9 - 12 = -3
Answer:
i think 9+(-4) and 9-4.
Explanation: i dont really know how to give an explanation. i hope this helps :)
