3x = 18
Take the logarithm of each side:
x log(3) = log(18)
Divide each side by log(3):
x = log(18) / log(3) = 1.25527 / 0.47712
x = 2.63093 (rounded)
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I believe the converse is: if 2x equals 6 then x equals 3 inverse: if x doesn't equal 3 then 2x doesn't equal 6 contrapositive: if 2x doesn't equal 6 then x doesn't equal 3
3+10 = 13
Assuming y' is dy/dx, y = x^4/4 + yx^2
18
y = 6 x 3.5; If you can't do that in your head, split it up: 6 x 3 = 18, 6 x .5 = 3, 18 + 3 = 21