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11.1

Step-by-step explanation:

cos42 = adjacent/hypotenuse

cos42 = x/15

x = 15cos42

x = 11.1471723822

11.1 =x

Step-by-step explanation:

Since we have a right triangle, we can use trig functions

cos theta = adjacent side/ hypotenuse

cos 42 = x/15

Multiply each side by 15

15 cos 42 = x

11.14717238 =x

Rounding to the nearest tenth

11.1 =x

"standard form:

3x2 + 14x − 10 = 0

solutions based on quadratic formula:

x1   = −14 − √ 142 − 4×3×(−10) /   2×3   = −14 − 2 × √ 79 /   6   ≈ −5.296

x2   = −14 + √ 142 − 4×3×(−10) /   2×3   = −14 + 2 × √ 79 /   6   ≈ 0.629

i belive false if so your welcome if not well idk