It is a linear equation in one variable r.
The solution to the equation is r = 1.
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6
When a negative number is raised to an even power, the result is always positive. Therefore, (-1)^4 equals 1. This is because multiplying a negative number by itself an even number of times will always result in a positive value.
There are infinitely many answers, including 1*623, 10*62.3, 100*6.23 (-1)*(-623) etc
36
1 times 4 = 4. 4+1= 5