Answer: 315 miles
Step-by-step explanation:
let onward speed = x mph, then distance = 7x
return speed = (x+18) mph, (same) distance = 5(x+18)
equating the two,
7x = 5(x+18)
2x = 90 ==> x = 45 mph
so distance = 7*45 = 315 miles
The answer is g
2x4.5-2.5=6.5
Answer:
Step-by-step explanation:
We have the following properties:
So, if we have that E[X(X-1)] = 27.5, we can write them using the first property as:
Then, replacing E(X) by 5 and solving for , we get:
Finally, using the second property and replacing by 5 and by 32.5, we get that V(X) is equal to:
Answer:
Step-by-step explanation:
its correct option is
A. log(12) - log(5)
hope it helps :)