Please help me with this

b

Step-by-step explanation:

D

Step-by-step explanation:

a^2 + b^2 = c^2

a = 10

c = 15

b = ?

10^2 + b^2 = 15^2         Substitute known values for a and c

100 + b^2 = 225           Subtract 100 from both sides

b^2 = 225 - 100

b^2 = 125                        Take the square root of both sides

sqrt(b^2) = sqrt(125)        

125 = 5*5*5

sqrt(b^2) = sqrt(5*5*5)

for every pair of equal factors, one can be taken from under the square sign; the other factor disappears.

b = 5 sqrt(5)

d

step-by-step explanation:

d