45
45 * 2 = 90
You can do this in your mind by adding 40 + 40 = 80, then add the two fives 5 + 5 = 10, and add those two sums together. 80 + 10 = 90.
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The question was cut up a bit. Some possibilities: 90 minus 2 [ 90 - 2 = 88 ] 90 plus 2 [ 90 + 2 = 92 ] 90 times 2 [ 90 * 2 = 180 ] 90 divided-by 2 [ 90 / 2 = 45 ] 90 to-the-power-of 2 [ 90^2 = 8,100 ] 90 equals 2 [ No Solution ] Add on to the discussion to edit the question, if it wasn't answered.
x is 30 to work it out- 3x 30=90 90-2=88
5x3=4 2x8=2 6x3=3 1x7=7/40
Well, isn't that a happy little math problem? When you multiply 4.5 by 2, you get 9. It's like adding a splash of sunshine to your day!
C = pi*r82 C = Pi*r*2 90=R Thus 180*Pi