It is an algebraic expression involving x.
Of do you mean 'what is x if 2x - 9 equals 9?'
2x - 9 = 9
⇒ 2x - 9 + 9 = 9 + 9
⇒ 2x = 18
⇒ 2x ÷ 2 = 18 ÷ 2
⇒ x = 9
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2/3 x 9/10 = (2x9)/(3x10) = 18/30 = 18÷6/30÷6 = 3/5
9
Oh, what a happy little question! When you have an array for 2 times 9, you can see 2 rows of 9, which equals 18. And when you have an array for 5 times 9, you can see 5 rows of 9, which equals 45. Keep exploring those arrays and you'll create a beautiful landscape of multiplication facts!
9
RT = 6 All you have to do is 15-9.