(image)
a.
the smaller the coefficient of x2, the narrower the graph
c.
the coefficient of x2 defines if the line is a parabola, a v shaped graph or a straight line graph
b.
the larger the coefficient of x2, the narrower the graph
d.
they are all the same graph; there is no change

a negative exponent is translated as follows:

so, we have

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