Question

Pls help for the 13th one
​

Answer 1

Step-by-step explanation:

hope this answer will be helpful

Answer 2

Answer:

Step-by-step explanation:

150 = 1/2* X* X+5

150*2 = x^2 + 5x

X^2+5x-300=0

X^2+20x-15x-300=0

X(X+20)- 15(X+20)=0

(X+20)(x-15)=0

X= -20 or X=15

Sides can never be negative so

X is 15

AB = X = 15cm

AC = X +5=15+5=20cm

By using Pythagoras theorem

BC^2 =15^2+20^2

Bc^2=225+400

BC=√625

BC = 25cm