Please explain how you got your answer( worth 10 points)

*formula*
(Number of beds)lwh/soil cubed

*substituted*
4 x 10 x 5 x 1.5/1.5
(4x10)
40 x 5 x 1.5/1.5
(40 x 5)
200 x 1.5/1.5

(Here you can do two things continue with current bedmas, or get rid of things that cancel each other out)

*continuing*
(200 x 1.5)
300/1.5
200
Therefore
She would need 200 bags

If you canceled things out you would emidiatly have 200

Please let me know if my work is incorrect and I’ll correct is ASAP

The image doesn't make sense. The triangle is isosceles but yet 13=18. Could you help me verify which sides 13 and 18 are?