At a certain time of day, the angle of elevation of the sun is 80°. To the nearest foot, find the height of the tree who shadow is 31 feet long. Please help me I’m really struggling

phosphate, calcium ion, chloride ion, neon atom

step-by-step explanation:

the answer is a.

135 and 80

step-by-step explanation:

"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