Answer:
D 53 is the answer I just took the test
I think it is 142cm^2. What I did to work this out is, 236 divided by 5= 47.2 ( to get the surface area of a 1cm cylinder) then multiply by 3 = 141.6 then round
456.89 would be 456.9 rounded to the nearest tenth.

<u>First Train:</u>
Time taken = 9 hours (2pm to 11pm)
Let the speed be x
Distance = Time x Speed = 9x
<u>Second Train:</u>
Time taken = 5 hours (6pm to 11pm)
Speed = x + 48
Distance = Time x Speed = 5(x + 48)
Since both the distance they traveled are the same, we equate the distance to solve for x.
<u>Solve for x:</u>
9x = 5(x + 48)
9x = 5x + 240
4x = 240
x = 60
<u>Find the speed:</u>
x = 60 mph
x + 48= 108 mph
Answer: The spend of the two trains are 60 mph and 108 mph.
an adult has 4.94 x 10^13 cells = 49,400,000,000,000
49,400,000,000,000 - 26,000,000,000 = 49,374,000,000,000
scientific notation form : 4.9374 x 10^13