:D The temperature went from -12°F to 18°F. Which of the following expressions could be used to find how much the temperature changed?

18 + (-12)
-12 - 18
-12 + 18
18 - (-12)

18 - (-12)

Step-by-step explanation:

Take the final temperature and subtract the initial temperature to find the change in temperature

18 - -12

18 - (-12)

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