The botanical pesticide "Pyrethrum" is derived

81 ÷ 0.09 × 1.4 – 1223=?

46% of 13/92 × 24/91 × 3500 =?

√121 + √961− √289 =?²

43.5 × [1/7 × (91 - 49) + 17(1/3)] = ?

What will come in the place of question mark (?) in the given expression?

1020 ÷ 51 × 5 + 540 of 25% - 10 = ?² 

9 × 4⁰ × 24² × 18² = ?²

721 +21 x 9 - 118 = ? + 82

What will come in the place of question mark (?) in the given expression?

? = (40% of 80% of 6400) ÷ 64

What is 12% of 4% of 7% of 2 x 10⁶ ?

34 × 2.5 + 6.4 × 1.5 – 4.8 × 1.2 =?