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(integral sign) {2x^3 - 7x^2 + 3x^1/2 -x}dx

So when i evaluated this integral, i got:

1/2X^4 - 7/3X^3 + 2*(3)^1/2 / 3 X^3/2 - X^2 +C

oookay, so that looks a bit confusing...so if you don't understand that, can someone post me the answer to this question?

My other question is:

Solve the following differential equation:

dy/dx = sinx-sec^2x

For this question, i got

-cosx-tanx+C

is that one correct?

Lastly, i would like to know if i got this answer right..

A pebble is tossed 6m/s down a cliff 72m high. how long will it take to hit the ground?

my final answer was 3.27 seconds..

any help would work you guys! thanks so much!