300 must be subtracted from the product of 25 and 23 to equal 275.
By solving through law of cosines the length s can be written as
.
Given the length of US is 9, the length of ST is 10 and the length of UT is s and the angle UST is 100 degrees.
According to law of cosines a length can be written as 
where c is the side opposite to the given angle and a and b are other sides , g is the angle given.

where s is the length of the side opposite to the angle given, the length of other sides are 9 and 10 where the angle is 100.
Hence the fourth option is correct which is s^{2} =9^{2} +10^{2} -2*9*10cos(100).
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Answer:
t ≥ 2
Step-by-step explanation:
3t ≥ 15-9
3t ≥ 6
t ≥ 6/3
t ≥ 2

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