For which question could a testable hypothesis be developed

For which of these questions could a testable hypothesis be developed? Check all that apply.

Does a flu shot hurt worse than a pneumonia shot?

x.   Will breeding a red rose with a white rose make a pink rose?

Are pecans better tasting than walnuts?

x.  Will practice help improve your reaction time?

x.  Whose pulse rate increases more after running up and down a flight of stairs, that of an adult or child?

Explanation: B, D, and E.  I just got it right

jupiter

explanation:

it is so massive and has such a strong gravitational pull its likely prevented the formation of a planet between itself and mars in the asteroid belt

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stan bts

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