The first one would be 3 x 3 x 3!
but the others i dont know!
——- answer founded ———
i remember this test, so 3 would be 3 x 3 x 3 because it has it on top w the ma so mark brainlist if correct!
15f -8f+ 13= 55
⇒ 7f+ 13= 55
⇒ 7f= 55- 13
⇒ 7f= 42
⇒ f= 42/7
⇒ f=6
Final answer: f=6~