There are infinitely many solutions.
One linear equation in two variables cannot be solved to give a single answer.
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2 to the 7th power equals 128....
x = 2 is an algebraic equality (Because there is an 'equals'(=) sign) x - 2 is an algebraic expression ( Because there is NO equals sign).
Sure thing, honey. If a equals 8, then you just substitute that bad boy in for a in the expression a-2. So, 8-2 equals 6. Ta-da! Your answer is 6. Hope that clears things up for ya, sugar.
I assume by 2 cubed you mean 2^3. That equals 2 * 2 * 2 which equals 8. 8 is rational, so yes.
cos60= 1/2 sin60=1.732/2