Please help

678 ft²

Step-by-step explanation:

The opposite sides of the cuboid are congruent, thus surface area is

2(11 × 9) ← front and back + 2(11 × 12) ← top and base + 2(12 × 9) ← sides

= 2(99) + 2(132) + 2(108)

= 198 + 264 + 216

= 678 ft²

intensity of the vector is v= √37 ≈ 6.08 units and make angle ∡α ≈ 9.46° with east direction

step-by-step explanation:

required vector is consists of the two componentsvx= 2+4=6 units   and vy= 1 unit and vx ⊥ vywe will use pythagorian theorem to find intensity of the vector vv∧2 = vx∧2 + vy∧2 => v = √vx∧2 + vy∧2 = √6∧2 + 1∧2 = √36+1 = √37 ≈ 6.08 unitsthe angle ∡α between vector and east direction we wil find with tanαtanα = 1/6 => α = arc tanα = arc 1/6 => α ≈ 9.46°

hope this