C. 119.84 d. 21.65 math questionif you get this right i will mark you as a brainliest

c^2 = a^2 + b^2 - 2 * a *b *cos(Y)

250^2 = 160^2 + 260^2 - 2 *160 * 260 * cos(Y)

62500 = 25600 + 67600 - 83200 * cos(Y)

83200 * cos(Y) = 25600 + 67600 - 62500

83200 * cos(Y) = 30700

cos(Y) = 307/832

Y = arccos(307/832)

Y = 68.35

X = 180 - 68.35

X = 111.65

The answer is B.

= 5

step-by-step explanation:

to find the 15th term substitute n = 15 into the nth term formula

= (- 3 × 15 ) + 50 = - 45 + 50 = 5