Here are two column vectors

2f = 2 × f. hence this is scalar multiplication

+25 = x

step-by-step explanation:

here x is the hypotenuse of a right triangle whose legs are 7 and 24.   by the pythagorean theorem, 7² + 24² must equal x²:

x² = 49 + 576 = 625.   thus, x = +√625 = +25 = x

1. 3

2. 4

3. 1

hope this ! have a great day.

-wfz