The answer is:
−6x2 + 2x − 4
Solution: 12x^3 - 4x^2 + 8x ÷ -2x = -6x +2x - 4
Answer:
D
Step-by-step explanation:
The answer to this problem should be the 4th one.
All real numbers can't be right as 0 obviously wont work. However, it is important to remember that sqrt of a number cant be negative, so x must either be greater than or equal to -1 and 1
Answer: the rate of the passenger train is 100 mph.
Step-by-step explanation:
Let x represent the rate of the passenger train.
The rate of the freight train was 10 miles per hour slower than the rate of the passenger train. It means that the rate of the freight train is (x - 10) mph
The passenger train traveled 100 miles. It means that the time it took travel 100 miles is
100/x
In the same amount of time, it took a freight train to travel 90 miles. It means that the time it took travel 90 miles is
90/(x - 10)
Since the time is the same, then
100/x = 90/(x - 10)
Cross multiplying, it becomes
100(x - 10) = 90x
100x - 1000 = 90x
100x - 90x = 1000
10x = 1000
x = 100 mph
90 × 7 = 630 , it's not hard, it's easy
rate of change for 2x+4y=10
here rate of change can be found by finding slope
the general form for slope is y=mx+b
isolating y on the left side:
2x+4y=10
4y=
-2x+10
from here slope is -1/2
Rate of change =-1/2
