Answer:
159
Step-by-step explanation:
k (9) = (2 * ) - 3
= (2 * 81) - 3
= 162 - 3
= 159
Question 8 of 10 This circle is centered at the origin, and the length of its radius is 3. What is the circle's equation?
1 answer:
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Answer:
3.5 hours
Step-by-step explanation:
Speed of train X=30 mph
Speed of train Y=40 mph
Relative speed When the two trains travelling in same direction
Relative speed=40-30=10 mph
Total distance =25+10=35 miles
We have to find the time when train Y is 10 miles ahead of train X.
We know that
Time=
Using the formula
Then, we get
Time=
Hence, it will be 3.5 hours until train Y is 10 miles ahead of train X.