Help me solve this problem

2

Step-by-step explanation:

Constant of proportionality is the ratio variable y and variable x, in which both are directly proportional to each other.

Constant of proportionality, k = y/x

Using any point in the line, say (2, 4),

k = 4/2

k = 2

Constant of proportionality = 2

b. the decimal could be two-tenths.

step-by-step explanation:

b. 24 mm

step-by-step explanation:

use the pythagorean theorem.

a^2 + b^2 = c^2

a^2 + 7^2 = 25^2

a^2 + 49 = 625

a^2 = 576

a = 24

answer: b. 24 mm