2 Wat is juist? Als een auto in 2 s versnelt van 3 m/s naar 7 m/s, A is de snelheid 2 m/s.
B is de snelheid 4 m/s.
C is de versnelling 2 m/s2.
D is de versnelling 4 m/s2.

what are the options.

explanation:

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west

the old price per ounce is c/4.

the new price per ounce is c/3.6.

the ratio of the old price to the new one is

(c/4)/(c/3.6) = (c/c)×(3.6/4) = 0.9 . . = 9/10 . . "nine tenths" in either form