I really need help someone please help

r =5

Step-by-step explanation:

We can use the Pythagorean theorem

a^2 + b^2 = c^2

The legs are r and 12

The hypotenuse is (8+r)

r^2 + 12^2 = (8+r)^2

r^2 + 144 = 64 + r^2 +16r

Subtract r^2 from each side

144 = 64 +16r

Subtract 64 from each side

144-64 = 16r

80 = 16r

Divide each side by 16

80/16 = 16r/16

5 =r

step-by-step explanation:

y-y1=4(x-x1)

step-by-step explanation:

this is point-slope form since you only have 4 as the slope it goes in place of m

hope this : )