If 0 represents sea level what integer best describes 15 meters below sea level

-15, and if it was 15 meters above, it would be 15 by itself. You can think about it like a vertical number line, as seas level is where 0 is.

0 is at the boundary, so 0-15 will be -15

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

i did it myself and i got 4.2 (b) hope its right

step-by-step explanation: